Batman Beyond - Season 3 Episode 12

In a Zeta Project crossover, the synthoid Zeta returns to Gotham with his friend Ro. While trying to make contact with Dr. Selick, they are attacked by Agent Bennet and his federal agents. The two split up, but Bennet manages to stop Zeta by attaching a disruptor to his back. Mad Stan, fleeing a battle with Batman, saves Zeta from "feds trampling his basic human rights." After bringing him back to his hideout, Stan discovers that Zeta is a synthoid. Suspecting that he's a killer robot sent by the federal government, he sends the recovering and grateful Zeta on his way -- with a bomb planted on his back.