Cinderblock busts into prison and the Teen Titans show up to stop a jailbreak. But when Robin and Cyborg's big sonic boom maneuver goes awry, the bad guys get away and the boys blame each other. An argument erupts and when the shouting stops, Cyborg quits! Meanwhile, Cinderblock returns to his mysterious boss Slade with his prize: a sleeping inmate, who becomes the monstrous Plasmus whenever he is awakened. With oozing Plasmus running amok at a Chemical Factory and Cinderblock toting a laser cannon downtown, can the four remaining Titans handle it all without Cyborg at their side?
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