In episode 4, Riley imagines taking flight in a fly-in-the-sky balloon to find creative ways to cool off Sunny, the sun, on a very hot day. Additionally, Riley explores making silly sounds, showcasing playful and inventive scenarios using imagination with a simple cardboard box as the starting point.

Riley uses the cardboard box as a magical object that transforms into different imaginative creations, such as a fly-in-the-sky balloon and a piano, enabling Riley to explore new worlds and sounds, demonstrating creativity and playful invention.

The main character in episode 4 is Riley, a bright-eyed bunny who leads the imaginative adventures. There is also an Adult character voiced by Ian James Corlett, who may provide narration or guidance, but the episode primarily focuses on Riley's creative play.

Riley faces the challenge of a very hot day and imagines surprising ways to cool off Sunny, the sun, using the fly-in-the-sky balloon. The episode addresses this by showcasing Riley's inventive thinking and playful solutions through imaginative flight and sound exploration.

Riley searches for silly sounds, which contribute to the playful and creative atmosphere of the episode. These sounds enhance the imaginative experience, adding a sensory dimension to Riley's adventures and encouraging young viewers to explore sound and creativity.