The Brain is a genetically enhanced lab mouse in Animaniacs whose sole ambition is world domination, voiced by Maurice LaMarche.

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The Brain

AliasesBrain
PublisherWarner Bros. Animation
First AppearanceAnimaniacs S1E3: H.M.S. Yakko (1993)
CreatorsTom Ruegger
Voice Actor(s)Maurice LaMarche
Powers/AbilitiesGenius-level intellect Engineering and invention Strategic planning Genetic mutation (sentience) Hypnotic voice
TeamsPinky and the Brain
Statusactive

The Would-Be Ruler of the World

The Brain is a genetically enhanced laboratory mouse at Acme Labs and the architect of an unbroken series of failed world domination schemes in Animaniacs. Maurice LaMarche voices the character in a performance modeled after Orson Welles, drawing on Welles's resonant baritone and authoritative delivery. The Brain speaks with absolute confidence in plans that consistently collapse due to factors he did not account for, most of them involving Pinky.

The character's intelligence is genuine. His plans are elaborate, technically sophisticated, and frequently brilliant in conception. The flaw is not in the planning but in the execution, where Pinky's chaos and the Brain's own ego introduce variables that even his considerable intellect cannot manage. He approaches each new scheme with no apparent memory of why the previous one failed.

His physical design emphasizes his large cranium, intended as a visual shorthand for his oversized brain. He is noticeably smaller than Pinky, which his bearing and manner of speaking entirely override. The Brain moves and speaks like a much larger creature. This contrast between his physical scale and his self-regard became one of the most reliable visual jokes in the series.

World Domination as Weekly Ritual

The Brain's plans follow no consistent logic in terms of method. He has pursued world domination through television, politics, financial markets, space exploration, art, and direct confrontation. Each approach is reasoned out in careful detail and presented to Pinky with the certainty that this time it will work. The plans fail with equal consistency, though the specific mechanisms of failure vary.

This structure allowed the writing staff to send the characters through virtually any genre or historical setting. The Brain's obsession provides the through-line while the specific scheme provides the episode's comedic scenario. The format proved flexible enough to sustain both the recurring segments in Animaniacs and three seasons of the spinoff series Pinky and the Brain.

His relationship with Pinky functions as the emotional core of every segment. The Brain is genuinely fond of Pinky, though he would strongly deny it. His frustration with Pinky is real, but so is his dependence. Episodes that separate the two tend to show the Brain functioning at reduced capacity, suggesting that whatever Pinky contributes to their partnership goes beyond his official role as assistant.

Maurice LaMarche and the Orson Welles Connection

LaMarche's vocal model for the Brain draws directly from Orson Welles, particularly the late-career Welles known for commercial voiceover work and television appearances. LaMarche has discussed the choice extensively in interviews, noting that Welles's combination of intellectual authority and barely concealed exasperation with the world perfectly matched the character. The impression deepened throughout the series as the Brain's ego and Welles's persona became increasingly inseparable in LaMarche's performance.

LaMarche received Emmy nominations for the role and has cited the Brain as one of the most creatively satisfying characters of his career. He reprised the performance for the Hulu revival series in 2020 alongside Rob Paulsen's Pinky.

Sources

  1. The Brain - Behind The Voice Actors (accessed 2026-03-23)
  2. Pinky and the Brain (accessed 2026-03-23)
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