Dr. X

Dr. X is the antagonist of JumpStart Adventures 5th Grade: Jo Hammet, Kid Detective.

Appearance
Dr. X has light purple skin. The top of his head is enlarged and has three blue-green spots on one side. He wears a white lab coat and black shoes.

In the Game
Dr. X first appears in the intro sequence. In Jo Hammet's nightmare, he enacts his revenge on the city by blowing it up. When Jo wakes up, there is a news report on the radio that says that the Hooverville television relay station was destroyed by Dr. X. Dr. X has vowed to destroy Hooverville, one building at a time.

Martin, who used to work for Dr. X, explains to Jo that Dr. X was a brilliant scientist in the field of animal behavior. Dr. X discovered a link between certain types of creatures and a neurotransmitter in the human brain, which would allow for limited cross-species communication. During one of his experiments, he received a heavy dose of radioactive toast, and he hasn't been the same since. Dr. X wants to get revenge on the companies which used to support his research, because he feels that they cut his funding unfairly.

At the end of the game, Dr. X disappears. His whereabouts are unknown, but Jo Hammet is still on his trail.