Adorable he may be but Timmy is a little lamb with a lot to learn. He has just turned 3 (in sheep years) and being an 'only lamb in the flock' Timmy has been used to getting his own way. Now for the first time Timmy is going to have to learn to get along with other little animals. Timmy and his classmates are playing trains, but both he and Mittens want to be the leader! By trying to outdo each other with increasingly impressive train costumes, they attempt to win over their pals, but soon realise that it's no good being the best looking train if there aren't any passengers left to play with.