The Teen Team' consisted of the Amazing Orion, the Stupendous Squish, and the Elusive Mistery. They also go by Orion, Squish, and Misty. They are three teenage superheroes that were from different galaxies in "outer space, of course" as Misty put it. They "felt like outsiders in their own worlds", so they left their homes, traveled through space, and "formed the Teen Team".
They came across Jenny when they tried to defeat Tadpolezilla in the episode Teen Team Time. After Misty found out it's weakness was spanking, Jenny helped them defeat it before learning about them and temporarily becoming a member. However, when Tadepolezilla matured and attacked the Goop Zone, Jenny wanted to defeat it even though the other members wanted to leave. After Jenny tried to defeat it, Misty came and helped her before Brad caught it's attention by a spotlight. The monster tried to attack Brad by its tongue, however the tongue hit the spotlight and the monster got electrocuted. Misty, Squish, and Orion then left to go back to the stars.
Misty and Squish's names involve their powers: Misty turns into mist and Squish squishes into something.
Orion, on the other hand, is probably named for where he might come from: possibly somewhere in the Orion constellation, the Orion Nebula, or the Orion Arm.