Cinderblock breaks into prison--and the Teen Titans arrive in time to stop a jailbreak. But when Robin (voiced by SCOTT MENVILLE) and Cyborg's (voiced by KHARY PAYTON) big "sonic boom" maneuver goes awry, the bad guy gets away--and the boys blame each other. An argument erupts; and when the shouting stops, Cyborg quits the team! Meanwhile, Cinderblock returns to his mysterious boss, Slade (voiced by RON PERLMAN), with a 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 all the chaos without Cyborg at their side?