Biography
When Chris turned 15, his birthday wish to become invisible was granted. Over the next 15 years, he saw movies for free, sneaked into government facilities, rode space shuttles, and stole stuff. On his 30th birthday, the wish wore off and he became visible again. He met up with Jack and then wished to become invisible again. (That friend you haven't seen since high school)
At some point, the second wish wore off. He reunited with Jack once more and they began working in an office together.
He read from the book of the dead and refused to help a hitch-hiking old crone; one of these actions led to him being placed in a time loop, during which he experienced the same Thursday a couple million times. During the loop, he learned how to speak Danish, juggle, and seduce Jack. He memorised excerpts from The Lost World by Michael Crichton (the novel that formed that basis for the film The Lost World: Jurassic Park (1997)). He also stole cars, tanks, and space shuttles. (Groundhog Daying)
He got abducted by aliens when filming Day 4 of The 12 Days of Chris & Jack. (A HOLIDAY MIRACLE) He later brainstormed with Jack how they should approach meeting aliens. (Let's Meet Aliens)
He visited Corplox and interviewed Gorbash. (Aliens Among Us, 55:15)