The Legion of Super-Heroes springs to action as Reign attacks National City in the trailer for Supergirl season 3’s return in 2018. Now that the origins of the team have been explained by Mon-El (Chris Wood) and Imra Ardeen/Saturn Girl (Amy Jackson) to the DEO and Kara (Melissa Benoist), it looks like these Super-Heroes are going to have to step up to the plate, what with Supergirl now in a coma following her intense battle with the World Killer Reign (Odette Anabelle).

As was revealed in the Supergirl season 3 midseason finale “Reign”, Kara was the inspiration for the Legion, as well as their mission to safeguard peace and ensure that justice is served. Given this, it makes sense that the (accidentally, time-traveling) squad would be willing to suit up in the 21st Century to temporarily carry out Kara’s responsibilities of keeping National City safe, while the Girl of Steel is recuperating from her battle ...

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