Mystery Mesa (Agua Dulce Ranch) as DEO Base Camp
The DEO tests Supergirl's abilities in the middle of the desert.
“Stronger Together” Filming Locations
Supergirl episode “Stronger Together” was filmed in Los Angeles in the United States of America.
Terminal Island Water Reclamation Plant as Plastino Chemicals
Hellgrammite kills a guard at a chemical plant and then Supergirl and the DEO are called in to investigate.
Source: IMDb
S.S. Lane Victory as Tanker Ship
Kara attempts to save a ship from a fire at the port but accidentally causes an oil spill.
Source: IMDb
Warner Bros. Burbank Studios as CatCo Worldwide Media (deliveries)
Kara arranges to meet both James and Winn behind the building as Supergirl.
Source: IMDb
Warner Bros. Burbank Studios as Dark Alley
Two soldiers sent by Astra attack Hellgrammite for his indiscretion at the chemical plant.
Former Sixth Street Viaduct as Viaduct
The truck carrying the DDT is attacked by the Hellgrammite while being protected by Alex and Hank.
Source: IMDb
Griffith Helipad (Griffith Park) as Hilltop Interview
Kara carries Cat's car to the top of a hill near the city for her interview.