After 81 issues, the Legion end their run in Adventure with issue 380, by Jim Shooter and Win Mortimer. The story is “inspired” by the Odyssey, and the title of the story clearly derived from the Kubrisk film.
Superboy receives a call from Dream Girl, who warns him of a prophetic dream she had. Immediately after, he, as well as Ultra Boy, Bouncing Boy, Duo Damsel, Light Lass, Sun Boy, Cosmic Boy and Invisible Kid are teleported to a strange planet, and Superboy is devoured by a dinosaur with kryptonite teeth. Cause, you know, it makes total sense for an animal to have teeth made from kryptonite.
The Legionnaires are in shock, but Ultra Boy rouses them and gets them working on a space ship so they can get back home. Bouncing Boy consoles a distressed Duo Damsel, the first hint at the romance between them, forecast in the Adult Legion story that saw them married.
The ride home lurches from disaster to disaster. Ultra Boy really shows his mettle in this story, saving the rest of the team time and time again. But repeatedly unusual events occur, strange things appear and disappear, enough that there is clearly something going on that the Legionnaires are not aware of.
Upon returning to Earth, they see robot duplicates of themselves being killed. Superboy then pops up to explain it all. Dream Girl foresaw their deaths, and the entire “odyssey” was arranged to keep them out of the way, while the robots suffered their fate. The Super-Pets had been acting in secret, causing the strange events. The villains behind the murder plot? More irrelevant characters who kill themselves without explaining their grand plan.
Not a high note to go out on.
The Legion switch places with Supergirl after this issue, being demoted to the back-up spot in Action Comics, while she takes over Adventure.
The Super-Pets appear again, in a few stories, but this is the last time they have a major role in any Legion tale.