Poor Captain Comet, he debuted in an era when superheroes were passe. Had he have only been patient and wait until the late 1950s he could've been one of the premier characters in DC Comics. As it was, he was dug up decades later to be the protagonist for a series about a criminal team.
Captain Sprocket didn't fare much better, nor should he have. Ill defined and played up for comic effect solely, he was more of a caricature than a character. Sure he seemed to have cool gadgets like Comet, but not much in the way of head knowledge to use them effectively.
This crossover would be doomed to failure right from the start, as Comet would return to space after seeing how humanity has remained fairly dense since he departed it years ago.