Chaz Lang is Penelope's older brother, who had returned from being away at private school in Mission: Earth. According to Penelope, he refused to attend anymore because he found the other kids too snobby. Chaz is athletic, really cool, and an amazing skateboarder, and appears to share a mutual crush with Betty, which makes Noah very jealous. Chaz and his sister don't really get along, as his down-to-earth demeanor makes him the black sheep of his otherwise snooty family.
Chaz is unaware of Betty's dual role, but it is hinted that Betty eventually reveals her secret to him, as in "The Future is Now", Chaz is among the Galactic Guardians of 2013.