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Blue Bowser, also referred to as Bowser's Brother, Bowser's Twin Brother, or Bowser Imposter, is a character that debuted in Super Mario Bros.: The Lost Levels as a boss, and is exclusive to the Famicom Disk version of it.
Bowser's Brother
Character Cameos:
for Character Cameos: in The Super Mario Bros. Movie 2
Suggested by user_293142
My pitch for the sequel.
