Its quite surprising that all the DC universe TV spin-offs, crossovers and webseries are fitting together. Superman original show Smallville was wrapped up after ten seasons in 2011. Then US network The CW launched first season of Arrow in october 2012.
Arrow was completely new take on the DC comics character Green Arrow having no connect with smallville or its version of Oliver Queen. The series was so hit that it was aired for second season also. Barry Allen’s entry, in the season two, as the forensic scientist was made. Barry Allen is known as The Flash to DC readers. Eventually Arrow got a third season. After the success of Arrow DC comic based series appeared in succession on different networks. The Flash on The CW, Gotham on FOX, Constantine on NBC. There is clear connection between The Flash and Arrow only. After cancellation of constantine by NBC after thirteen episodes, first network crossover occured with John Constantine visiting Arrow in its fourth season on The CW.
Then there was crossover between Arrow and The Flash showing DC’s Legends of Tomorrow featuring characters from both the shows. The New show Supergirl on CBS (sister network of The CW) and Gotham at Fox remained unconnected until the Flash broke through the walls between network and payed Supergirl a visit.
After this the news broke that Supergirl would move from CBS to The CW for the second season. Arrow, The Flash, DC’s Legends of Tomorrow and Supergirl will all make a big comeback and will all be involved with the annual big crossover. Freedom Fighters: The Ray is another addition to this universe.
FOX has ordered pilot for a new series ‘Black Lightining’ produced by Greg Berlanti. previously mentioned shows are also produced by him. But there is no information if this series will be in the same universe. ‘Powerless’ is DC comics comedy series. This is NBC’s upcoming show but it is not connected to any other show. Its trailer show up wonder woman, nothing about her is heard on any other show. Could be that, in the end, all will be connected.
All these shows air weekly in the US, so two or more shows in airdate order can be conveniently watched. Last season The Flash aired on Tuesday, Arrow on Wednesday and DC’s Legends of Tomorrow on Thursday. Only discomfort is moving from one story arc to other.
All DC’s shows can be watched either by airdate or by story arc. There are number of episodes connected to one another.