Action 455 (Jan. 76) has never been an issue I cared for. Maggin, Swan and Blaisdel seem to be begging for laughs, with a central character based loosely on Mel Brooks.
Morty Rivers is a film producer, and one of Oliver Queen’s client’s. While watching a game show (meant to be Let’s Make a Deal, by the reference to costumes) he gets the idea to build the main character for his next film,and contacts Oliver to promote it.
Superman leaves the Atom in Kandor, where he is helping them work a new viewer. Oliver contacts him, and gets him to interview Rivers as Clark Kent. A chain reaction of accidents result in Kryptonian energy passing through the viewer, trashing Rivers’ creation, but also bringing it to life.
The Junkman rebuilds himself, and heads towards any Kryptonian source of energy – like Superman, or, later Kandor.
Green Arrow helps Superman as they follow the robot to the Fortress of Solitude.
The Atom gets very little to do in the story, spending all but the very end in Kandor. It’s doubly unfortunate, as his back-up series has also ended.