More like a secret then an easter egg, but in Doom II one of the secret levels is a replica of the first and last levels of Wolfenstien 3d from the first episode, complete with soldiers from the game. Grosse was replaced by a cyber demon. At then end you got to kill 4 Commander Keens that were hung.
Two other ones were in Doom 3. Type a cheat from Doom I or II in the console and it will say "You remembered well". Another is near the end of the game is a secret passage that leads to a ritual altar with a PDA on it that has messages from the developers.
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