Star Trek/Legion of Superheroes is a 2011 comic book miniseries, a crossover between the Legion of Super-Heroes and the popular sci-fi TV series, Star Trek. It marks the first time that any crossover has taken place between any part of the Superman Mythos and the Star Trek universe.
On a return trip to the future aboard their Time Bubble, several members of the Legion of Super-Heroes find themselves stuck in a time eddy and are forced to make an "emergency landing" in the 23rd century.
Meanwhile, the crew of the Starship Enterprise beam down to Earth so that Captain Kirk can give a commencement speech.
Both groups discover that they've appeared on a drastically changed Earth.