The Alien Doctor deals with issues of inclusiveness and bullying. Sam and Tracey discover a spaceship and a repulsive alien called Zenon. At first they are scared, but Zenon is injured and Sam gets the Professor to help. He uses his time machine to send Sam into the future to find someone who can save Zenon. But while they are gone, Dexter, the school bully, decides to capture the alien. Can Sam find someone to help, and can they all survive Dexter so Zenon can fulfil his destiny of making peace with Earth?