Though it is often implied in the TV series that X-5 is an outdated model of Galactic Guardian robot, newer, more advanced model Galactic Guardian robots that have been debuted in episodes, such as X-8.5. in the episode Bye-Bye X-5, have tended to be less reliable. In the third season, he also becomes a scientist and inventor, working in the lab in Galactic Guardian Headquarters with the Bangoons (and also Noah in the third season's Crash Test Noah! shorts) as his test subjects and his assistants, and inventing new gadgets that are used by Betty on her missions. He also dons a disguise sometimes to make him look somewhat like a human. When he visits Betty's home, he tries to "improve" upon the appliances in Betty's house while cat-sitting, as in the Season 3 episode Aarrgh...It Be 'Olidays