Angela and Old Tom go to the local swimming pool, where they meet Lucy who is practising for her swimming certificate. Billy is also there and starts showing off. However, he goes too far and is kicked out of the pool by the lifeguard. Angry and jealous, Billy tries to sabotage Lucy's attempt at her swimming certificate by turning on the pool's wave machine. However, he accidentally breaks the machine, knocks out the lifeguard, and ends up in the pool himself. Old Tom saves them both by ingeniously pulling out the plug and draining the pool.

Angela buys Old Tom a novelty radio, shaped like an apple. However, Old Tom, thinking it is an apple - eats it! All of a sudden, strange voices start coming from Old Tom. Angela thinks Old Tom can talk, until a doctor diagnoses the problem and offers to remove the radio. However, Angela can't afford the operation, so Old Tom tries to raise money by entering a singing competition, using the radio as his 'voice'. The deception is discovered and Old Tom is thrown out, so Angela goes to a bank to apply for a loan. Suddenly two bank robbers enter, but a broadcast from Old Tom's radio makes them think they are under arrest, and they give up. The police chief arrives and pats Old Tom on the back, dislodging the radio. With the reward money, Old Tom buys a new radio.

In the final episode, Old Tom seems to be back at square one - rejected by much of the community. On a trip to the observatory, Billy causes trouble but Old Tom gets the blame, so he runs off and hides in his old rocket ship. When Billy accidentally unleashes an asteroid which threatens to destroy the world, Old Tom takes off in the rocket - with Lucy and Angela - and manages to avert the catastrophe at the last minute. Old Tom lands the rocket back on Earth, in the middle of Lavinia's party, where he is finally appreciated for who he is - wild, free-spirited and occasionally berserk - but always a hero.