Quote from Jay Garrick / The Flash in the episode Spoiler: We Couldn't Get Green Lantern
Jay Garrick / The Flash: Oh, this is the most ridiculous story I've ever heard. Stuart: [scoffs] You want ridiculous? You fought against Captain Boomerang, Captain Cold, and Captain Nazi. Jay Garrick / The Flash: Hey, those were all formidable enemies. Boomerang kept coming back.