8939 Hudson Bay Street as Sam's House
Sam plays with Ruby in the morning and then sees a newspaper on Reign's attack.
Source: AprilBC23 — Twitter
“Legion of Superheroes” Filming Locations
While Kara is trapped in a coma while recovering for her injuries Reign wreaks terror over the city.
Supergirl episode “Legion of Superheroes” was filmed in Langley, Vancouver, & Burnaby in Canada.
Alley (south of Richards, west of Pender) as Alley
A man steals a delivery van after knocking out the driver.
201 Street (between 102b & 102) as Street
The stolen van is driving away from the police when Reign flies through and takes away the driver.
402 West Pender Street as National City Savings & Loan
J'onn, Alex, and the DEO stage a bank robbery to draw out Reign.
Killarney Secondary School as Albatross Bay Correctional Facility
The Legion of Superheroes draw out Reign and fight her in the prison yard.