Start here?
A relatively standard - though admittedly better - story about the Legion of Super Heroes from one of their earliest appearances. This involves some more mostly random time travel, and the villain here is really a stretch in terms of any kind of application (hate tapes drive his rampage.) It is nice though to see the Legion slowly materializing, with Mon-El now a member of the team. This is a mostly pretty forgettable, if still entertaining enough story, and perhaps might be a good point for starting to read the stories of the futuristic team.