When Rex's old colleague is found dead, the League must care for his orphaned Omega Pets and conduct an investigation.
Rex is saddened to learn that his ally Omega Ted passed away. After learning Ted was murdered, he suspects an enemy from their past: Frau Mantis. Rex and American Ranger go to Omega Ted's H.Q in Antarctica. After realizing he hasn't spoken to Ted in over 40 years, Rex admits he has been a bad friend and Ranger gets angry at Rex as he thinks Rex didn't try enough to find him when he was stuck in the Time Tunnel, instead delegating the effort to Omega Ted.
Meanwhile according to Omega Ted's will, the League gets custody of his Omega Pets consisting of Buster Nut the Squirrel, Chet the Bulldog, and Ganky the Pony. At first, the League is overjoyed at the news. However, the relationship takes a turn for the worse as Ganky abuses Brad, Buster Nut controls Cooch, and Chet annoys Jewbot. Black Saturn gets jealous that he doesn't have a super pet so he get his own pet called Murder Pig.
Rex and Ranger discover that the Omega Pets killed Ted and inform the League. The pets reveal they want revenge on the League for keeping them in Antarctica because Rex made Omega Ted go there to find American Ranger. The Omega Pets were defeated by the League and the Murder Pig where Ganky was killed by Brad.
