Monstro is a sea monster on ABC's Once Upon a Time, that appears to be a large predatory whale that dwells in the ocean and is known for attacking people at sea.



On a stormy night at sea, Monstro pursues Pinocchio and Geppetto, who are on a raft. However, they manage to escape Monstro's gaping maws and make it to shore. Afterwards, Pinocchio keeps a small wooden whale, in reminiscence of his encounter with Monstro.



  • S1, E20: "The Stranger" (flashback)

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