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Doctor Strange in The Multiverse o Madness - The Loop
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Number 51 is an alien who was a former Stonecutter. His rank is more than likely a reference to "Area 51".
History
He sings "The Stonecutters Song" along with the other Stonecutters. It is unknown whether he joins The Ancient Mystic Society of No Homers.
Non-canon
Treehouse of Horror X
He is seen in the audience while Kang and Kodos are on stage.
Appearances
Episode – "Homer the Great"
Episode – "All Singing, All Dancing" (archive footage)
THOH – "Treehouse of Horror X"
Video game – The Simpsons: Tapped Out