G.I. Joe: Renegades

Castle Destro (1x17)

Air date: Apr 22, 2011

Tracing the prototype Techno-Viper's signal following it's defeat, the Joes end up in Scotland. While there, the Joes become trapped inside Destro’s castle during a recon mission investigating a Cobra weapon called the Bio-Dag, a missle that dispenses Bio-Vipers on the masses.