Arrow

DCTV Crisis on Infinite Earths Crossover wasted no time with the cameos. In the very first scene we see Robert Wuhl from Batman 1989 movie, Burt Ward who played Robin in the Batman 1966 TV series, Hank Hall and Jason Todd from DC Universe's Titans series, and The Ray from Earth-X.

Official website: https://www.cwtv.com/shows/crisis-on-infinite-earths/
Official Facebook page: https://facebook.com/TheCW
Official Twitter page: https://twitter.com/TheCW
DCTV Crisis on Infinite Earths Crossover playlist: https://www.youtube.com/playlist?list=PLfrisy2KXzkfFB6XFUCNnPUC3WIsHawag