Magister Labrid

Magister Labrid is the first active Plumber to appear in the Alien Force series. He appeared to be a fish-like creature, similar to Ripjaws, and it appeared that he was only able to stay alive in a water-like liquid that his suit was filled with.

History
He first showed up in the first episode Alien Force, because he thought Ben had stolen the Omnitrix. He tracked Ben down from the Rust Bucket all the way to where Gwen took karate lessons. When he first appeared he was wearing an ID mask. When he took it off, you could see his face clearly. He attacked Ben and Gwen while they were still locked inside the karate lessons building. Eventually, Gwen managed to capture him using her powers. After he explained himself, he apologized for attacking Ben, as he thought Ben was just some kid who stole the Omnitrix. He calls DNAliens air breathers, and appears to feel strongly about his job. He accompanied Ben and Gwen to a stakeout where a weapons trade held by Kevin between the DNAliens and The Forever Knights was occuring. They managed to take down Kevin while the DNAliens and the Forever Knights got away.

He also appeared in a flash back in Moonstruck to help Max rescue the anodite Verdona and was also the one to recruit Max into the plumbers. They are also shown to be a long time acquintance of Max.