Jenner is the main antagonist of the 1982 animated film The Secret of NIMH.

What Makes him Pure Evil

  • Attempted to wage war against humans.
  • Killed Nicodemus by causing the Brisby house to fall on him, nearly causing the deaths of the Brisby family as well.
  • Attempting to steal the stone from Mrs. Brisby.
  • Mortally wounds Sullivan for betraying him.
  • He has no excuse for his actions other than his lust for power.


  • Despite the fact that Jenner is Pure Evil, only the Secrets of Nimh version of him is, while the original from the book didn't even bother with trying to commit such sinister acts such as killing Nicodemus for tyrannical supremacist motives.

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