Crease Clinic (Riverview Hospital) as Arkham Asylum
Deegan performs unethical experiments in the opening and after being defeated he is locked up next door to Psycho-Pirate.
“Elseworlds, Part 3” Filming Locations
With the entire universe transformed to turn Deegan into Superman, Kara finds herself locked in S.T.A.R. Labs with her powers dampened while Barry and Oliver are on the run as wanted fugitives.
Supergirl episode “Elseworlds, Part 3” was filmed in Vancouver, Coquitlam, Surrey, & Langley in Canada and Chicago in the United States of America.
Oceanic Plaza as Museum Square
A group of schoolchildren watch Superman fly overhead and later cheer after he saves them from the falling crane.
West Parking Garage (Bentall Centre) as Construction Site
Barry and Oliver learn that Deegan has taken on the guise of Superman in this altered reality but they manage to escape him despite not having any powers.
Alley (south of Bute, west of Pender) as Alley near Construction Site
Barry and Oliver hide from a passing police car while discussing who they can go to for help.
601 Bute Street as Cisco's Apartment Building
When Oliver and Barry attempt to enter Cisco's apartment they find themselves in the Monitor's strange reality.
BC Place Stadium as S.T.A.R. Labs
The two Supermen battle outside the labs and then Clark attempts to use the book to restore the universe.
Surrey Civic Plaza as Central City Plaza
The heroes from two worlds fight together to stop Deegan from using the book to once again rewrite reality.
846 248 Street as Kent Farm
Clark and Lois tell Kara that they will be returning to Argo because Lois is pregnant.
LondonHouse Chicago as Bat-Signal
Kate Kane calls Oliver to tell him about potential trouble with Deegan at Arkham.