"The Flash" returns for its third season on Tuesday, October 4, and will lead into the premiere of the new comedy series "No Tomorrow." "Arrow's" fifth season premiere follows on Wednesday, October 5. "Supergirl" will start its second season -- its first since moving from CBS -- on Monday, October 10. And lastly, "Legends of Tomorrow" will return for its sophomore season on Thursday, October 13.
Other comic-based shows like the returning "iZombie" and the new Archie Comics-based "Riverdale" are slated to return/debut midseason. You can see the entire debut schedule below.