Books in the Jumpman series

Theodore Pine Four has hair that constantly changes colour, a coat that talks to him and a defective Jumpman Pro! Jumpman is the hilarious account of Theo's time in Mil 3 (which he is VERY unimpressed by) and of Jules and Gen's heroic efforts to rescue him and return him to his own time.

The year is fifteen billion and seventy-three and Theo - teenager, TimeJumper, legend - is the biggest celebrity on the Two Planets. Theo knows there's only one rule when you TimeJump: Don't Touch Anything. They have no idea they're about to TimeJump three thousand years into the future, become invisible, spy on Theo, and try to save the world.