Pick up where the story ends.

Kellian and the adult purple alien in a purple dress appear beside a glowing display of a brick house inside the spaceship.

Kellian lies in a recessed spaceship bed, then gets up after the adult leaves.

Kellian enters a transparent cylindrical machine labelled 'Beam me to Earth'; a blue effect surrounds him, followed by his appearance outside on Earth at night.

Chloe wears glasses and a red football-style shirt; Callum wears a pale printed shirt. They sit at a wooden dining table with Grandad and colourful modelling materials.

Grandma wears a floral blouse and blue trousers in the living room, beside a television and fireplace.

Kellian climbs over the garage, moves through the rear garden and enters the house through a sliding patio door.

Kellian falls from the dining table. Chloe gets out of bed in pink striped pyjamas and descends the stairs.

Chloe approaches Kellian in the living/dining space and crouches beside him under the table.

Chloe brings Kellian into her pink bedroom, places him inside the wooden wardrobe and returns to bed.

Chloe wakes in the same pink bedroom. Callum arrives in blue patterned pyjamas, bounces on the bed, and meets Kellian at the wardrobe.

Grandad uses a laptop at the dining table; the following garden shot shows him riding a small steam locomotive.

A sparkling effect changes the children's pyjamas into daytime clothing. Chloe retains glasses and wears a red shirt; Callum wears a pale printed shirt.

A brightly coloured motorcycle appears in the bedroom. Callum climbs on; it subsequently becomes a large green frog.

Grandma throws a cushion toward Grandad, who is sitting beside the television showing football.

Kellian and the children vanish from the bedroom, appear outside the brick house, fly over the neighbourhood and waterways, and reach a wooded setting.

The trio explores a wood with deer, rabbits and a stream. The children examine a low woven-branch den.

Kellian stands in front of a towering fantasy tree structure; subsequent shots reveal spires, bridges and platforms amongst enormous trees.

The trio flies back and lands outside the brick house.

The final scene returns to Grandma and Grandad in the living room, now with stacked boxes beside the television.

Chloe and Callum eat burgers and chips at the wooden dining table.

Kellian shops in Aldi wearing a curly blonde wig, dark glasses, a colourful dress and red shoes, then enters a bright green open-top sports car.

The green car drives along terraced streets, vanishes in a bright effect and appears outside the brick house.

Grandma and Grandad watch a television news report about an alien spotted in Aldi. Chloe sees the report; Callum uses headphones and a tablet.

Chloe finds disguised Kellian with Aldi bags in a bedroom. His disguise disappears. Outside, Grandma and Grandad stand by the green car; another adult joins them, whose identity is not established here.

A red dragon joins the children by the patio doors, carries them through the countryside to a beach, and changes into Kellian on landing.

The trio paddles by the sea and watches a large sea creature or vessel emerge offshore; its exact identity needs closer verification.

Grandma stands in a bedroom beside the discarded blonde wig and colourful outfit. Intercut shots show Grandad playing a drum kit.

Kellian and the children ride a blue roller coaster and dodgems. The dodgem cars travel out through streets and along the beach. A Jet2-branded aircraft passes low overhead.

The trio appears in the aircraft cockpit. The aircraft finishes on a residential street, with the children and Kellian still in the cockpit.

A TV news bulletin shows the dragon above a motorway. Grandad brings Grandma to the television.

Kellian gestures in the bedroom but produces a green cloud. The children react; Callum wears a red number-7 shirt and Chloe a pale top with pink trousers and glasses.

Grandma appears in the curly blonde wig and colourful dress. Grandad reacts; another cushion is thrown. Outside, the green car and the aircraft from the previous episode remain visible.

An extended view travels from Earth into space and approaches a large wedge-shaped spaceship.

Kaylian and Kevlian appear in the spaceship. Kevlian wears a flat cap and holds a dark drink container. Kaylian checks the empty bed, then shouts.

The bedroom is shaken and objects fall; downstairs, Grandma and Grandad sit amongst fallen objects near the dining table.

Kellian gestures and the bedroom contents move back into place.

Kellian talks with Chloe and Callum in the bedroom. Speech content must be checked separately.

Chloe video-calls Dan from the dining table. Dan sits at several computer displays in a cluttered room.

Chloe and Callum see a Kelly Konka Chocolate Factory advertisement on the living-room television, including a golden ticket inside an ornate egg.

Kellian leaves the bedroom. After a visible two-hours-later card, he conjures a giant boxed Kelly Konka egg beside the television.

Grandma finds the egg. The children open it and uncover a golden ticket; Grandad plays with a tabletop train.

The children show Kellian the ticket. A winged green Kelly Konka steam locomotive appears above the house and they materialise in its cab.

The flying train carries Chloe and Callum through clouds into a landscape of giant sweets, chocolate-coloured waterways and industrial towers.

A purple alien host in a purple top hat and suit arrives on a flying carpet and carries the children into the Kelly Konka factory. The host’s identity should not be equated with Kellian solely from appearance.

The children explore a factory with copper pipework, production lines of large eggs, mushroom-like structures, clocks and a chocolate waterfall.

Chloe and Callum board a transparent spherical brass-framed flying machine. Callum holds its steering wheel as they tour inside and outside the factory.

The children splash in a chocolate-coloured pool with large brown fish.

The top-hatted host returns with the winged locomotive. The children board and the train flies away towards the sunset.

Kellian, now wearing a navy tracksuit and white trainers, settles in an armchair in the green-walled living room and falls asleep.

Grandad drives a red saloon past a jumping pig and a mobility-scooter rider. The aircraft remains on the residential street and the green sports car remains outside the house.

Grandad discovers Kellian asleep, reacts with alarm and retreats into an armchair while Kellian approaches him.

Kellian goes to a red-brick house with a yellow van outside. Dan leaves his multi-monitor computer room and speaks with Kellian on the pavement.

Kellian gestures across the road; a worn pink saloon appears in a sparkling effect.

Grandma, Chloe and Callum visit a boating lake, feed ducks and use a playground. Other visible gags include a cow, a large man and a fish leaping from the lake.

Grandma takes a phone call beside the swings; intercut shots show Grandad on the phone in the living room.

Dan makes a phone call, drives the pink saloon to a red telephone box, and drives away carrying the box upright above the car.

Grandma and the children see Dan pass with the telephone box. They return home and gather with Grandad in the living room.

Kaylian and Kevlian appear at a spaceship control panel, then the large craft descends through clouds and over the neighbourhood.

A black-and-white cow enters the neighbourhood and is lifted into the spaceship. It appears in the cockpit with Kaylian and Kevlian, then chases them through a corridor.

The children sit in the bedroom while Kellian, in his tracksuit, camps beside a small barbecue and a green tent near a lifting bridge. He gives a paper map to a stork-like bird.

The bird carries the map over waterways and rooftops to the purple front door of the brick house. The Jet2 aircraft, green sports car and red saloon are still visible nearby.

Grandma throws a cushion at Grandad in the living room, where his model railway equipment is visible.

Curtis drives a dark grey BMW i8 with black detailing and arrives outside the house. Its raised door and interior are visible.

Curtis joins the family and examines the map with Chloe and Callum at the wooden dining table.

Kellian appears beside Dan and the red telephone-box contraption. Cables, electronics and a screen reading TELEPORTATION READY surround it.

Curtis drives Chloe and Callum in the BMW i8 across the lifting bridge to the tent.

Kellian continues talking beside Dan and the telephone-box machinery.

Curtis and the children inspect the tent, lift a floor hatch and discover a long staircase descending underground.

Curtis, Chloe and Callum descend the marble stairway into a large mansion atrium with white marble, gold railings and a spiral staircase. Kellian greets them wearing his vest and striped shorts again.

Dan enters the telephone-box contraption while Joel operates equipment outside. The display changes to TELEPORTATION COMPLETE; Dan appears in the spaceship bedroom and encounters the cow by the controls.

Kellian and the children talk on blue sofas beside a circular central fireplace in the mansion.

Curtis explores an extensive indoor sports-car collection while on his phone. Intercut shots show Jake beside a red van outside a Magnet building.

Kellian and Curtis talk beside the mansion’s indoor pool. Kellian holds up a key; Curtis lifts him and celebrates.

Curtis, Kellian and the children regroup beside the pool. Curtis displays an enlarged muscular arm during their conversation.

Dan rides the cow through the spaceship’s industrial interior. It reaches Kaylian and Kevlian and knocks Kevlian over.

The BMW returns through the neighbourhood. Grandad plays with a model railway on the living-room floor. Kellian arrives and sits close beside him.

A HOUSE FOR SALE sign appears beside the neighbouring brick house. The closing gag shows a squirrel holding a sign saying it is not a tree rat.

Grandad now wears pink trousers. Kellian wakes in a room crowded with clocks, electronics and portraits of his parents, plays through a huge speaker stack and hides under the bed after the blast.

Chloe and Callum investigate the noise. Chloe finds Kellian under the bed. Outside, a squirrel clings to Grandad as he runs away.

Dan is with the cow, Kaylian and Kevlian in the spaceship, then approaches its controls.

Joel and Curtis stand by the tent and BMW; Joel uses his phone as the spaceship descends. An on-screen caption identifies Barnby Dun, Doncaster.

Dan appears at the spaceship steering wheel. The ship then descends into a river; water enters the cockpit. Kaylian and Kevlian end up in the water with a floating armchair.

Curtis drops Joel outside the red-brick house, where Joel meets the silver-armoured Harry beside the yellow van.

Grandad runs through the neighbourhood with the squirrel on his shoulder. Curtis sees him from the BMW.

Curtis stops outside the Glasshouse pub, does press-ups beside the BMW and meets Dan. The pair head inside.

Kellian and Grandma take a green bus into town and visit Primark. Kellian handles clothes, towels, hats and a trolley filled with rubber ducks.

Grandad and the children dance in the room full of clocks. Kaylian and Kevlian arrive at the purple front door and knock.

Kaylian and Kevlian leave the purple front door and notice the neighbouring house for sale. Kaylian drags Kevlian away.

Kellian and the children arrive in town by pink limousine, meet Curtis outside PureGym and walk to McDonald’s.

Callum orders at the counter; a visible till shows 1000 and the staff stack a tall trolley with food.

Kaylian takes Kevlian into White Gates estate agents, confronts the suited agent and brings both men onto a bus.

Kellian and the children enter Jeanine’s Crochets, a pastel-fronted shop with yarn-filled shelves, crochet displays and a central counter. Jeanine wears red tartan.

Jeanine hands the children small crocheted purple alien dolls. They leave carrying the dolls; Kellian reacts to their appearance.

The trio passes visible shop signs including Dan’s Teleporters, Greggs, Joel’s Star Wars and Grandma Doll House. Signs establish what is depicted, not legal ownership.

They enter Karl’s Kebabs. Karl wears dark glasses and a striped apron, eats a kebab behind the counter, then assembles very large portions for the children.

Kaylian, Kevlian and the estate agent enter the neighbouring brick house. A case full of money changes hands; Kevlian settles on a sofa.

Grandma and Grandad arrive in the red saloon outside the purple-door house and talk inside the car.

Grandad watches television coverage of efforts to retrieve the crashed spaceship. BBQ Pig is in the living room wearing a white covering marked BBQ.

Grandad pushes a green lawnmower across the front garden.

Kellian and the children see a poster for Steve’s 80s gaming. An elderly woman rides an ostrich through town with police behind her.

The trio visits Steve in a retro computer shop. He has a moustache and denim jacket. After Kellian casts magic, Steve appears as a block-shaped game character in a blue shirt.

Kellian and the children run, jump and bounce through residential streets. A caption identifies Kirk Sandall.

Kaylian throws a cushion at Kevlian on the sofa and leaves the house.

Kaylian looks through the neighbours’ window at BBQ Pig, then speaks to Grandad by the patio doors. Grandad retreats inside.

Kaylian and Kevlian talk in the street beside the red car.

A twin-rotor helicopter passes the riverside camp and lifts the crashed spaceship from the river. Curtis phones Dan from beside his tent and BMW; Dan answers from his computer room.

Kellian and the children see the spaceship overhead, run home, and reunite with Kaylian and Kevlian in the street. The alien family embrace. The Jet2 aircraft remains in the neighbourhood background.

Grandma and Grandad are in the living room with BBQ Pig. The pig jumps through the window.

BBQ Pig runs across the lawn and street. Grandad chases it while Chloe and Callum watch. Kellian walks with Kaylian and Kevlian outside the neighbouring house.

Kaylian shows Kellian a plain bedroom. His magic transforms it into a bright toy room with cloud-pattern walls, a red racing-car bed, building blocks, a model railway and looping orange car track.

An upholstered armchair flies over the neighbourhood. Its passenger is not clearly established by these sampled views.

Grandad pursues BBQ Pig, falls on his back and meets the elderly woman riding the ostrich. He climbs aboard behind her.

Curtis drives his dark BMW behind the ostrich riders, returns to the houses and begins press-ups. The ostrich jumps over him and the car. The interior driving view shows a right-hand steering wheel.

Kaylian and Kevlian talk in their living room. Kevlian goes into a narrow kitchen crowded with green cans and opens a well-stocked fridge.

Kaylian changes into Grandma’s appearance: a blonde bob, cream cable-knit jumper and blue trousers, retaining purple skin. Kevlian changes into a dark polo shirt and pink trousers, resembling Grandad but remaining purple.

The actual Grandma and Grandad stand in the living room with the ostrich sitting on the sofa.

Curtis meets the elderly woman in the room with bookshelves and a wooden table. She performs press-ups, flexes a very muscular arm, and shakes his hand while he kneels.

Kellian phones Chloe and Callum from the new toy bedroom. The children answer while sitting on a bed elsewhere. His disguised parents prepare to go out.

Chloe and Callum appear in the toy bedroom. Kellian shrinks Callum into a blue toy car; he drives the orange loops before returning to normal size.

Curtis jogs through the street carrying the elderly woman on his back.

The disguised alien parents arrive at the purple front door and encounter the ostrich in the doorway.

Kaylian and Kevlian visit the grandparents while wearing their disguises. Kevlian sits on the sofa with the ostrich; Grandma addresses him beside the television.

Grandad operates an extensive model railway in the loft, among exposed wooden roof beams. Kaylian climbs through the floor hatch and startles him.

Kevlian lies on the living-room floor as the ostrich pecks around him; Kaylian enters.

Kellian and the children leave the toy bedroom, run downstairs and enter the back garden. Chloe addresses Kellian before he casts a purple spell.

All three are tiny among grass and leaves. Callum mounts a ladybird and rides it along the soil.

A tabby cat approaches. The tiny trio hide in a hollow at the base of a tree while the cat paws outside.

The trio encounter a large ant, worm, frog and rabbit at their reduced scale, shelter in a terracotta pipe, then rest on a stone.

Grandma and disguised Kaylian drink together in the book-lined room. Grandad and disguised Kevlian share drinks beside a round barbecue in the garden.

A gull steals a sausage from the barbecue and carries it over the houses. A sausage lands beside the tiny trio, who eat from it.

The tiny trio explore worms, caterpillars, dew, pollen, a stag beetle, a dragonfly, a many-legged arthropod and a strawberry plant. The magnified surroundings reflect their small size.

They discover a gold-coloured coin with a portrait and lettering naming Victoria. Exact denomination is a dialogue claim requiring verification.

They pass an ant carrying bread, a wasp drinking from a drop, a woodlouse, a snail and a discarded can. The garden becomes dark and they encounter a moth.

Still tiny in the dark garden, Kellian phones Dan. Dan answers in his computer room. The episode ends with the size problem unresolved on screen.

Kellian, Chloe and Callum remain tiny in the moonlit garden. They pass a pink-dressed doll, enter a weathered dollhouse and encounter a spider outside its balcony.

Dan consults his phone at the desk in his computer room and leaves his chair.

Harry, still in full metal armour, is in a room crowded with monitors, an aquarium, burgers and drinks. Dan enters and speaks with him.

Dan drains the aquarium into a bucket, pours cans into it, blends burgers and pours the mixture into the tank. He holds a hairdryer over the solution. These are fictional actions, not a real recipe.

Dan carries the tank outside, places it on the roof of the pink saloon and drives away through the dark streets.

Curtis continues exercising while carrying the elderly woman on his back. Dan’s pink car passes them.

Dan arrives outside the houses and phones Kellian. The tiny trio stand near the oversized sink inside the dollhouse.

Dan carries the tank to the garden dollhouse. The trio cross its cluttered interior and climb the stairs to the balcony; the tank is positioned outside below them.

The trio jump into the brown solution and swim through it, then grow larger and emerge beside Dan. Steam rises from the tank. They walk away at their restored size.

The children are back indoors in changed clothes: Chloe wears a black top with a pink 67 and pink trousers; Callum wears a blue top and grey trousers. Kellian begins a game of hide-and-seek.

Disguised Kevlian tries to hide inside the kitchen cupboards. Kellian searches the living room, then the kitchen. A green cloud appears behind Kellian, who runs out and falls; the children are behind the sofa.

Kevlian crawls into another cupboard and ends up upside down. Kellian finds him before regrouping with the children.

Callum counts in the kitchen. Chloe and Kellian hide in a laundry basket in the hall. Kevlian searches behind cushions and a lampshade before crawling underneath the sofa.

Kaylian, still dressed as Grandma, sits on the sofa with Kevlian trapped underneath it. Callum finds and eats chocolate in the kitchen. The ending leaves Chloe and Kellian’s last shown hiding place as the laundry basket.