Dr. Fen

“	So what?! I got the reputation, I got the robot! YOU STAY AWAY!!	„
	~ Dr. Fen revealing his true nature after being exposed of his theft.

Dr. Fen is the main antagonist of the Kim Possible episode, Grudge Match. He is a rather dimwitted roboticist working for the Middleton Institute of Technology.

He was voiced by Tom Kenny, who also voiced Uncle Howee in The Haunting Hour, Binky the Clown in Shakes the Clown, the Dirty Bubble in Spongebob Squarepants, the Chritchellites in Samurai Jack and Stuck Chuck in Kid Cosmic.

History

Dr. Fen was a co-worker of James Timothy Possible (the father of Kim Possible) at the Middleton Space Center. Despite his fair relationship with Dr. Possible, the latter is confused as to how Fen was able to obtain a perfect position since he is completely incompetent at his job. This was shown as the robots that Fen built would only cause harm or damage to himself, much to his frustration.

When the news reports that a robot was stolen from the Institute, Kim and Ron Stoppable met Fen, who explained that one of his robots (which was designed with self-preservation) was stolen by his former lab assistant Vivian Francis Porter, whom he fired because she 'couldn't keep up', though Dr. Possible truthfully claimed that Vivian had quit the lab because she had enough of Fen's behavior. Searching around through the lab, Kim found a strand of hair which actually belongs to Vivian.

Kim learns that Vivian is currently a member of the robot fighting club called the Robot Rumble, so she heads over there with Ron and her cousin Larry (who is a member of the club) to confront her. However, Vivian angrily denies that she had stolen the robot from Fen, and is backed up by her boyfriend Oliver, who tells the gang to leave. Despite this, Kim and Ron are able to retrieve the robot from the arena and return it back to a delighted Fen.

However, the facts behind the caper start to make Kim suspect of something wrong when Dr. Possible comments on how clueless Fen can be over robotics despite his position. This was backed when her friend Wade searched for any work that Fen has done; as it turns out, Fen has never got any article or scholarship on robotics, and that Vivian has accomplished them instead. Kim then realizes that Fen is the real thief as he felt jealous towards Vivian for her tremendous work, and that he framed her in order to get his hands of her robot and take credit for it. Kim also suspects that Fen may have stolen much of Vivian's work when she was working at the lab, which is most likely how he got his new position and why Vivian quit out of disgust.

The next day, as Fen is deciding to figure out how to activate the robot, Vivian and Oliver arrive at the lab to confront him for stealing the robot. When Kim and Ron arrives, Fen asks the two to call security on Vivian and Oliver, but Kim states that she's calling the security on Fen instead as she's aware that Fen staged the entire theft to take credit for Vivian's work. Realizing that he's been exposed, Fen angrily tells the four to stay away and tries to escape the lab with the robot, but Kim uses a giant electromagnet to sweep the robot from his hands. Oliver ends up being pulled into a magnet as well, revealing himself to be an android built by Vivian. After Kim deactivates the magnet, Vivian admits to having kept her reputation as a secret due to her academia colleagues refusing to acknowledge her work because of her beautiful looks, and that Fen was taking advantage of the colleagues' bigotry for his own ambitions. An angry Fen grabs a mallet and is about to destroy Oliver out of spite against Kim and Vivian for exposing him, but Vivian's robot grabs him by the lab coat with a grappling hook, much to Fen's distraught. Dr. Possible and the police arrive to the scene where Kim explains the truth about what really happened.

It is implied that Fen is sent to prison on the charges of fraud and theft while Vivian is reinstated back into the Institute to take Fen's place as Dr. Possible's new co-worker.