Children's animation about a dinosaur who joins a circus and travels the world. Mrs Hamilton hears that her brother Aloysius has gone missing in the Himalayas. With Tom, Tip and Wanda the search takes them to the mountains, where Miss Hatch and Weedon are trying to track Tom down. Tom and his friends discover Aloysius, who has lost his memory and has been looked after by a family of Yeti. The sight of his sister stirs his memory.