Supergirl
Season 3, Episode 10: Legion of Superheroes
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Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached. Mon-El recruits one of the Legion members, Brainiac-5, to try to bring her back. Meanwhile, Reign continues her rampage on the city so the DEO teams up with the Legion of Superheroes to try to stop her.
All Episodes - Season 3
Episode 1
Girl of Steel
Episode 2
Triggers
Episode 3
Far From the Tree
Episode 4
The Faithful
Episode 5
Damage
Episode 6
Midvale
Episode 7
Wake Up
Episode 8
Crisis on Earth-X (I)
Episode 9
Reign
Episode 10
Legion of Superheroes
Episode 11
Fort Rozz
Episode 12
For Good
Episode 13
Both Sides Now
Episode 14
Schott Through the Heart
Episode 15
In Search of Lost Time
Episode 16
Of Two Minds
Episode 17
Trinity
Episode 18
Shelter from the Storm
Episode 19
The Fanatical
Episode 20
Dark Side of the Moon
Episode 21
Not Kansas
Episode 22
Make It Reign
Episode 23
Battles Lost and Won