"The Brain Buster" is the thirty-ninth episode of the first season of Justice League Action. It is the overall thirty-ninth episode of the series.
A mysterious creature abducts Batman, Mr. Terrific, Lex Luthor, Calculator, and Brain to put them to the test to discover the smartest among them.
Appearing in "The Brain Buster"
- Justice League
- Batman (Bruce Wayne)
- Mister Terrific (Michael Holt)