Dr. O

Dr. Listick, also known as Dr. O, is an antagonist in the JumpStart series. He is a male snail character who is CJ's nemesis.

Appearance
In JumpStart Reading for Second Graders, Dr. Listick had mustard-yellow skin and a brown shell. He wore a brown tuxedo with a white collar, a red tie, and a red button. He also wore a monocle over his right eye.

In JumpStart Advanced 2nd Grade, he has peach skin and a darker brown shell. His tuxedo is now purple with a silver button, and he wears his monocle over his left eye.

Personality
Dr. Listick is devious and sly. He dislikes and constantly tries to one-up CJ.

JumpStart Reading for Second Graders
Dr. Listick and CJ both want to find the lost city of Ursulab. At the beginning of the game, Dr. Listick steals an ancient tablet holding the secrets of Ursulab from CJ. Then he attempts to trap CJ in an underground pit. CJ continues to search for Ursulab, and Dr. O and his minions constantly attempt to stop him.

JumpStart Advanced 2nd Grade
Dr. Listick, called Dr. O in this game, causes all sorts of problems that JumpStart Headquarters has to fix. His schemes include freezing up the JumpStart Lake, filling a schoolhouse with worms, and attempting to make CJ's house sink into the swamp. CJ and Edison start collecting clues to find his hideout. Eventually his hideout is discovered, and Hopsalot creates an invention to capture him.