|Episode name pun on: Force K|
|Airdate:||June 22, 2001|
"Knock It Off"
"Forced Kin" is an episode where the Powerpuff Girls must team up with Mojo Jojo to stop an alien force from enslaving the Earth.
Townsville is being invaded by an alien, and the Powerpuff Girls go to inspect. They tried to destroy the mothership but the alien copied all their special moves. Reluctantly the Girls decide to ask Mojo Jojo for his help in stopping the invader.
Mojo, though at first unwilling to help he realises that he'll be destroyed along with the earth. Giving the girls instructions on how to stop the aliens plans them. The girls then try to take out the alien themselves after it shows itself but it easily beats them. The alien suddenly destroys all of the places that Mojo had always wanted to.
But after the alien invader calls itself the earth's new ruler and the most evil being in the universe Mojo finally snaps and goes completely bananas on the alien, attacking him and demanding him to say that he is the most evil. Afterwards, the alien is gone and Mojo unintentionally becomes the town's new hero, despite him demanding he is evil.
- [Mojo has beaten the alien senseless and is grabbing his leg]
- Mojo: Say it!
- [no response]
- Mojo: SAY IT!
- [still no response]
- Mojo: SAY IT!
- Alien: YOU ARE THE MOST EVIL!
- Mojo: And don't you forget it!
- This is the first where Mojo Jojo is the protagonist instead of the girls.
- This kinda follows in the video game Relish Rampage.
- The girls also seem to be weak against shock because they got knocked unconscious from the alien's electricity.
- Dexter from Dexter's Laboratory makes a cameo appearance in this episode, as well as his last.
- In this episode, you can see that the stripes on the girls' dresses are actually belts.
- This is the second time Mojo is considered a hero for doing something nice for the girls, the first time was in "Just Another Manic Mojo."
- The alien somewhat resembles Galactus from Marvel comics.
- The episode also uses a different version of the 1998-2001 animated episode outro.
- This is also the last episode to use the 1998-2001 animated episode outro.
- The satellite that the girls land on while fighting the mothership has 'Mos Def' printed on it, a reference to the rapper of the same name.
- During when the girls are fighting the alien ship, Buttercup's dress stripes are gone. When they crash into Earth, they are back.