Good crossovers are few and far between but, as a huge fan of both Star Trek movies and Legion of Super-Heroes comics (from the Mark Waid days on), I was excited to pick up the first issue to try it out. Luckily I was able to snag the last one on the rack. As each issue was released, it got harder to get a copy unless I was there the day it came out. It was popular and after reading the hardcover, I can see why.
When Kirk, Spock, McCoy, Sulu, Chekov, and Uhura board a transporter pad bound for shore leave and Cosmic Boy, Saturn Girl, Lightning Lad, Chameleon Boy, Shadow Lass, and Brainiac 5 escape the time stream, both groups end up in an alternate universe. It seems both universes have merged. The alien races from the Legion of Super-Heroes are present as well as a twisted version of the Federation of Planets. The two teams track a chronal aberration - each other - and quickly decide that they should team up to figure out how to restore their time streams.
The story is fantastic and each team is very well handled by Roberson while Moy and Jimenez do a great job with likenesses, action, and the two page spread showing all the various 'time machines' the villain has confiscated will make the most hardcore fan faint. I can't say enough good stuff about this mini series as it seemed effortlessly well told and was fun and action packed and had a satisfying end.