Grim Adventures Of Billy And Mandy (the) Easter Egg - The Secret of the Universe
It isn't precisely IN the episode, but the episode "Secret Decoder Ring" is episode number '42'. According to the Hitchhiker's Guide to the Galaxy, 42 is the answer to life, the universe, and everything, a concept similar to the secret of the universe.
4.8/10 with 16 votes
||Anonymous on 08-27-2005
The episode 'Secret Decoder Ring
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