The CW's biggest crossover event yet, "Crisis on Infinite Earths," is going down well with fans. It's already delivered a ton of cool cameos from across adaptions of DC's work, with the first few minutes alone bringing us Robert Wuhl’s Alexander Knox reading about Burtonverse Batman stopping Joker, then to DC Universe's Titans-verse, then Russell Tovey’s The Ray on Earth-X before finally (and best of all) stopping off at Earth-66 where Burt Ward’s Dick Grayson sees the oncoming disaster and yells “Holy crimson skies of death!” On top of that, we've revisited Smallville and seen Kevin Conroy play an unexpectedly sinister Bruce Wayne.