In a story that continues from this month's TEEN TITANS #16, the Titans find themselves in the 31st century teamed with the Legion against a threat that even their combined might not be able to handle. Win or lose, the future is about to change!
See part 1 in Teen Titans #16.
In this issue, the Legion of Super-Heroes was rebooted again from the post-Zero Hour Legion to the Threeboot Legion aka Legion of Earth Prime.
Also Superboy, return to the present.