Big Guy and Rusty the Boy Robot

The Reluctant Assassin (1x5)

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Dr. Gilder, the Legion Ex Machina's mole within Quark, has developed a personal grudge against Donovan, so he takes control of a prototype and tries to assassinate him. Donovan is taken to the S.S. Dark Horse for his own safety. Gilder then hacks into Rusty, gives him a ""big gun"", and sets out to destroy Donovan.