Captain Cold is a supervillain and a member of the Legion of Doom.
In "L.O.D.R.S.V.P.", Captain Cold was present at the party at Hall of Doom when the Legion was deciding between Harley Quinn and KGBeast as the potential new member. He was seen mingling with Gorilla Grodd and later with Solomon Grundy and Scarecrow. He was present during the attack by Aquaman as well as when Harley was announced as the new member.
In "A Seat at the Table", Captain Cold applauded when Harley and her crew were officially welcomed into the Legion of Doom. He also sat at the Legion's weekly pitch meeting where he along with the rest of the members voted to approve Joker's plan to build a giant tower with his face on it before Harley interjected and questioned his plan.