The Superman Family #215

In "Crisis at the Crossroads in Time!", Supergirl [Linda Danvers] faces a dangerous criminal wielding futuristic weapons tied to air pollution, forcing her to confront a threat that reaches across time. When a future version of herself appears, warning of the villain Tal Belok and the growing danger to Earth’s atmosphere, she must join forces with Superman, Alan Ward, Herb Silver, Marilyn "Mitzi" Silver, and the Righteous Knights to prevent a catastrophe that could reshape the timeline.

Lois Lane stumbles upon a reclusive billionaire living under a new identity, unaware of the danger closing in. When his nephew tracks him down, Lois must protect the man who once lived twice—before the past catches up with him.