Operation Gus-Jistu is the eighth episode of season 2.
the Spiez are called in to investigate why a pair of slippers that seems to have ties to ancient ninjas has been stolen. The Spiez learn another ninja figure is in their hometown, and when they arrive they learn Gus Junior has adapted the skills of the ninja making him an opponent more powerful than they could have ever imagined. The B-story, this new know-it-all robot, Virtual Virgil, replaces Marc as the homework helper. Marc is out to prove that Virtual Virgil doesn't know everything.
Mission No. 734 Villain: Gus Jr. (2)