Why is there a Commander Keen sprite in Doom II

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In the original sprites in Doom II, there is a sprite of Commander Keen. Why is he there?

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Best Answer

He's actually in the game, it's not an unused sprite. It's in level 32: Grosse, which is accessable from secret map 31: Wolfenstein. As you might have guessed by now, the levels/sprites are references to ID's other games. The level's name and other graphics are all Wolfenstein references though, the only Commander Keen reference is the killable prop.

You kill 4 Keens to open the exit of the level. He's just an object to hurt, he himself isn't an enemy and doesn't do anything.