Season 5, Episode 10 - "JLU-10-Far From Home"
On Supergirl's 21st birthday, she, Green Lantern, Green Arrow are kidnapped and taken to the 31st Century by Brainiac 5 and Bouncing Boy of the Legion of Super-Heroes, where Supergirl is destined to embark on her very last mission -- a battle against the Fatal Five and the Legion itself. It is clear to highlight that Kara, won't be back from the future, as is intended according to DCAU chronology. In many ways, this episode was intended as a pilot for the Legion animated series, but ultimately the resulting series is unrelated to this episode.
