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♪Oh, oh, BMO, how'd you get so pregnant?

Who's the mother? Oh, who's the father? Shh, I'll tell you if you keep it a secret. We will, we will, we will! All right, last night, an electric presence came into my room and said, "BMO, I need your perfect body to host the human incarnation of a baby!"♪

~ A song sung by BMO in the episode "James Baxter the Horse." It sings the song with an egg in a red cup taped to its body, which it apparently considers "being pregnant." After the song, a passing butterfly knocks the egg out

Moe Mastro 'BMO'  Giovanni Jr. is one of the major deturagonists of Adventure Time and is Finn and Jake's living video game console system, portable electrical outlet, computer, music player, VCR, video player, video editor, roommate, camera, alarm clock, toaster, flashlight, strobe light, skateboarder, soccer player, tape player, chef, detective, and friend. They make their appearance in the title scene of the Theme Song of every episode of Adventure Time, just as Finn and Jake pound their fists together. BMO is characterized as a loyal, trusting and helpful robot who is protective of Finn and Jake.


When Patrick McHale was preparing a short animation for Cartoon Network, he had a robot character named "RAYE" for that purpose, which Pendleton Ward and McHale both loved.[1][2] However, after Adventure Time got picked up, RAYE was redesigned and became BMO.[1]

BMO's voice was originally to be similar to a computer-synthesized voice, but as a result of a suggestion from Ward, Niki Yang's natural voice (also voiced Lady Rainicorn) with some adjustments became the voice of BMO.[3] As a result, BMO speaks with a Korean accent. Earlier voice actors for the character included Dee Bradley Baker (voice of Cinnamon Bun) and Thurop Van Orman (voice of the Tree Witch).

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