Golden Brain is the main antagonist of Spy Kids: Mission Critical. He is the leader of the counter-spy organization S.W.A.M.P.
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He has been described as the "diabolical leader" of his nefarious counter-spy organization S.W.A.M.P. (Sinister Wrong-doers Against Mankind's Preservation), and is determined to take over the world with his organization and has ascended to power in the counter-spy community.[1][2]