Zack Larsen is a senior at Mission Creek High. Minor character in the Lab Rats universe. His older sister is a famous actress. He us extremely involved in the school he goes to. He's in the Speech and Debate team. He's the president of Student Council. He also participates in musicals. He's been reported to be a very kind person. However, Bree has doubts about his true nature. Chase likes him, since both are very smart. His first appearance is in the episode "Too Nice"