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Kato-chan & Ken-chan (カトちゃん&ケンちゃん) is a side-scrolling action game developed by Hudson Soft for the PC Engine.
It was based on the Japanese television show Kato-chan Ken-chan Gokigen TV, with hosts Ken Shimura and Cha Kato assuming the role of playable characters. The game was repurposed for its North American release as J.J. & Jeff.
Kato-chan & Ken-chan's gameplay is very similar to that of the Adventure Island series, but instead of having to need to get a weapon to attack enemies, the characters can kick them.