Arrow is an American television series created by Greg Berlanti, Marc Guggenheim, and Andrew Kreisberg for The CW. It ran on October 10, 2012. It is currently on its fifth season.
- The Flash with "The Scientist" and "Three Ghosts" as a backdoor pilot.
- Legends of Tomorrow with The Flash "Legends of Today" and Arrow "Legends of Yesterday" as a backdoor pilot. Sara Lance and Ray Palmer from Arrow joined the cast in the pilot.
- Constantine, John Constantine, appeared in "Haunted".
- Vixen, Mari McCabe, appeared in "Taken", and Arrow appeared in several episodes of Vixen.
- Supergirl, Kara Danvers, appeared in "Invasion!".
Westphall connection in Arrow
- Blue Sky meth from Breaking Bad appeared in "Keep Your Enemies Close".
Westphall disconnections in Arrow
The name, Dominic Alonzo, a character from Arrow "The Undertaking", was used in Hawaii Five-0 "Ho'oilina". However, the Alonzo in Hawaii Five-0 had died eight years prior to the episode about six and a half years before the Arrow episode.