Time spheres and transporters sure make for convenient universe-crossing plot devices. Naturally, with any crossover between companies, dimensional barriers are going to be breached somehow, especially if there is no reason for the characters to interact as if they had interacted before this meeting being shared in the issue you just picked up.
Such is the case here. The Legion and the crew of the Enterprise have scads of dedicated fans, and if those fans were depicted in a Venn diagram, there would certainly be a decent overlap. It just seems natural to tap that crossover interest and reward it with a crossover.
This crossover features the classic version of the Enterprise crew: Kirk, Spock, Bones, Uhura, Sulu, Chekov, and Scotty. The classics are made moreso in that they appear to be based on the cast from the television series. The Legion, meanwhile, is represented by Cosmic Boy, Saturn Girl, Shadow Lass, Chameleon Boy, Brainiac 5, and Lightning Lad. Again, all classic versions.
The story doesn't deal as much with the two crews meeting as much as it does setting up the meeting for the rest of this series. Chris Roberson skims across the basics of the collection of characters, giving the Legionnaires a chance to showcase their powers and the Enterprise crew a chance to demonstrate their skills. The chances aren't deep, which matches the characterization to this point, but fans of either franchise will undoubtedly be satisfied with the initial introduction put forth in this issue. More casual fans of those licenses will feel the need to refer back to the character breakdown at the start of the issue to be sure they know who's who.
The double-Moy art team of Jeffrey Moy and Philip Moy alternate between strikingly brilliant and underwhelming corny. Moments when the characters from Star Trek are in their settings tend to be more comfortable and complete. The characters look like they should, but once taken out of their "comfort zone" the poses, body language, and expressions of those characters becomes far more animated than the characters who have spent the greater portion of their existence on the comic page. The art definitely has energy about it that powers the characters and panel layouts, but the caricatures break form just a little too much and a little too frequently for my preference.
As starters go, this issue is decent. Clearly, it is aimed at the audience of one or the other of these casts of characters. Roberson focuses on establishing the setting and players in this issue and doesn't do much to provide clues as to who the big bad of this story truly is. Frankly, given the matchup of Legion and Star Trek, I'm not sure most fans will care too much if there aren't any villains to match up against so long as Brainiac 5 and Mister Spock have a chance to exchange logical conversation.