Adventure is the twentieth episode from Hi-5 Series 4.
- NATHAN goes on a deep sea diving adventure.
- CHARLI pretends to be a dolphin.
- KELLIE and Chats look for animals that start with A.
- CHARLI pretends to be an albatross.
- TIM imagines to travel to Brass blowers land, where he becomes a tuba.
- CHARLI pretends to play a flute, a trumpet and trombone.
- KATHLEEN makes a game for Kellie, hiding cards inside her wall.
- CHARLI pretends to swim.
- SHARING STORIES: Kellie tells us a story about a boy (Tim) who celebrates his birthday having a fancy dress party, so his mother (Charli) helps him to dress up like Captain Wonder, but soon they find out that his friends (Nathan and Kathleen) dress up like Captain Wonder too.
- All of the segments in this episode are repeated in Series 6.