Zix, Travoltron, and Tee

Zix, Travoltron, and Tee are former alien fugitives.

History
They have committed quite a few thefts throughout the galaxy., and have also been seen attempting to trick human child prodigy, James Isaac Neutron, and his friends out of the astro-rubies that they had excavated by telling them about "ruby madness", an alleged mental state caused by greed that causes one to do anything to guard their horde.

The trio are make a short appearance floating in space. The building of McSpankey’s flies by and they commandeer it as their new vessel, and make a cameo appearance in Win, Lose and Kaboom.

They appear again in The Incredible Shrinking Town when everyone is tiny. Upon realizing everyone is much smaller, they plan to sell them to alien children as toys. Their plan is foiled when Jimmy and his friends, in their miniature state, pretend to be their conscience and turn them against each other, with Carl using ventriloquism to turn the three against each other.

The trio appears one final time in the series finale as part of the group the episode is named after, and is the episode in which they have their largest role. Their part of King Goobot's master plan involved sealing Jimmy's lab in green sticky goo that will keep Jimmy from being able to get in. Tee is set to guard Jimmy and Sheen when the two are imprisoned aboard The Junkman's ship, and Sheen forms a friendship with Tee, convincing Tee to leave with him and Jimmy when they escape. When they use their pod to reunite with Carl, Cindy, and Libby after crashing on a different planet, Tee initially frightens the three until Sheen convinces them that he is good now. When returning to Retroville while it's caught in a wormhole leading to prehistoric times, Tee is confronted by Zix and Travoltron about his decision to switch sides, but when they are cornered by a giant snake, Tee tries to convince Jimmy to help them, because even though they are still evil, they are still Tee's friends. Even after the N-Men rescue them, Zix and Travoltron refuse to be good until Tee convinces them that they have no reason to be evil and are not villains after all. After saving Jimmy by telling the T-Rex to go eat Baby Eddie. After discovering it feels good to be good, they abandon their positions in the League of Villains. After helping Jimmy and the others defeat the League of Villians and restore Retroville, Sam invites them into the Candy Bar and Zix promises to pay for the treats.