Story continues in Superman: Last Stand of New Krypton (DC, 2010 series) #1.
The Legionnaires respond to a chronal rift in space that Brainiac 5 traces to his ancestor's fight with Superman 1,000 years in the past
After Element Lad reveals himself to Superboy, Conner brings Mon-El to a gathering of all the Legionnaires living in the 21st century. The Legionnaires tell Superboy and Mon-El about their secret mission in the past to save the future and then they all head off to New Krypton.
Awake, Part 1 of 3
How Car-Vex went from the Phantom Zone to Zod's sleeper agent within General Lane's Project 7734