A shiny red ball appears in a blue sky and disappears behind different fluffy white clouds.

[Gentle music plays]

The title appears and a person reads, BOOSNOO!

The episode title appears, and the person reads, UNDERWATER.

The red ball bounces onto a sheet of cloud-like cotton. A person picks up the ball and pushes it through a hole in a white wall.

[Chime music plays]

In a blue room, the ball lands on a transparent curved track. It rolls down the track among paper clouds.

[Ball clattering]

[Ball rolling]

The ball rolls off the end of the track and bounces off different coloured platforms. Each platform lights up.

[Gentle, cheerful music plays]

The ball lands on a transparent curved track and rolls down another set of different-coloured platforms into a transparent tube, which then passes through a hole in the wall.

[Gentle, upbeat music plays]

In another room, the ball rolls past a purple number 5, a yellow number 4, a blue number 3, a pink number 2, and a green number 1. The ball drops down a purple funnel onto a spring.

[Clanking]

[Spring creaking]

The spring launches the ball high into the air into a wide funnel. The ball slowly rolls around the funnel and down a curved tube, passing through another wall into another room.

[Whooshing of the ball rolling]

The ball bounces off different coloured knobs.

[Clanking]

[Chiming]

The ball hits the knobs and the knobs change colour. The ball bounces off wide circular platforms toward tracks, each labelled with a triangle, a circle, and a square. The ball bounces between the tracks and then rolls down the circle track. The circle label flashes red.

[Circle dinging]

Underwater, light shines over a pink clam, an orange clam, a yellow clam and a blue clam on a pile of sand.

[Splashing]

The ball sinks into the different clams one after another. The clams open and knock away the ball. The clams reveal a shiny pearl inside and then close. The ball first floats from the yellow clam to the orange clam, then to the pink clam, back to the orange clam, the yellow clam, and then the blue clam.

[Gentle celebratory music plays]

The ball floats over to a hole in a pile of sand with a light shining out.

[Bubbling]

[Gentle music plays]

In a pink room, the ball rolls out a wall, down a track into a tube, and around a spiral pattern in a large funnel. Then, it drops down the funnel onto a metal track.

[Upbeat music plays]

The ball rolls down an orange and yellow track through a hole in the opposite wall.

[Bubbling]

Underwater, the ball sinks past a starfish and purple and green underwater plants toward a pink and blue jellyfish. The two jellyfish bounce the ball back and forth. They then bounce the ball into a pipe in a wall of rock, and a door on the pipe closes.

[Pipe clanking]

In a pink room, the ball rolls down a colourful track and drops down a tube onto a metal track.

[Tropical music plays]

[Clanking]

The ball rolls toward a half-blue and half-purple set of stairs. The purple half of the stairs moves up and down. The ball rolls onto the first purple step and moves to the blue one. The ball rolls back and forth up the steps.

[Accordion notes playing]

At the top of the stairs, the ball rolls down a track and through a hole in the wall. It drops down a transparent tube into the water.

[Splashing]

[Gentle music plays]

Clumps of string move through the water like fish. The ball floats among the string and sinks past a sparkly green clump of string. Elsewhere in the water, the ball sinks past a blue piece of fabric, a yellow piece of fabric, and a purple and pink piece of fabric being dragged through the water and look like fish. At the bottom of the water, the ball sinks into a hole in a pile of sand.

[Gentle music continues]

In a blue room with paper clouds, the ball rolls down a blue track past a picture of the ball underwater floating over the orange clam and down a colourful spiral track. The ball bounces off different coloured platforms that light up and past a picture of the ball underwater between the blue and purple jellyfish.

[Gentle music plays]

The ball slowly rolls down another set of different coloured platforms past a picture of the ball under water sinking toward a hole in a pile of sand among pieces of fabric in the water. The ball rolls down a track to a hole in the wall. The ball drops out of the hole in the white wall onto the sheet of cloud-like cotton.

[Melodic music plays]

The ball appears and disappears from behind the fluffy white clouds in the blue sky.

Logo: BooSnoo!

[Soothing music plays]

End credits. Creator and Executive Producer Julian Bashford. Mackinnon and Saunders Producers Tracy Liddell, Chris Bowden. Logos: Visionality. Mackinnon and Saunders. Copyright Sky U.K. Limited 2023. For more information go to Sky.com. Logo: Albert.

[Paint splattering]

Logo: Sky Kids.

[Gentle music plays]

Logo: Thunderbird Distribution.