Crossover starts tonight on @CW_TheFlash - read these scripts and genuinely loved them as a comics fan. You will love this! Blast to work with @StephenAmell @tylerhoechlin and @MelissaBenoist - couldn’t stop laughing. Enjoy - we did! #theflash #arrow #supergirl

— Hartley Sawyer (@HartleySawyer) December 9, 2018