Jenner

Jenner (voiced by Paul Shenar) is the main antagonist of Jaden and The Secret of NIMH. His goal was to kill Nicodemus and steal the amulet that he gave to Mrs. Brisby. He was able to kill Nicodemus, but a fellow rat name Justin challenged Jenner to a swordfight. Jenner was killed after his sidekick name Sullivan betrayed him and threw a knife into Jenner's back.