Bouncing Boy and Duo Lass accidentally free Kantuu from his centuries-old prison, and they and Element Lad and Colossal Boy Take Kantuu on in a battle that comes to a cliffhanger climax.

Bouncing Boy and Duo Damsel accidentally release a demon called Kantuu when they are on a trip on an isolated planet of frost. The demon moves directly for Earth and Duo Damsel informs the Legion of the events, with Element Lad and Colossal Boy answering the call. Kantuu is able to defeat Colossal Boy, Bouncing Boy, Element Lad and Duo Damsel easily, continuing his unknown pursuit.