The creators of "Arrow", Greg Berlanti, Marc Guggenheim and Andrew Kreisberg, are planing to bring some important characters from Oliver Queen's (Stephen Amell) past in the premiere episode of season 4 and one of them could be Sara Lance aka White Canary (Caity Lotz).

During The CW Television Critics Association's semi-annual press tour, network president Mark Pedowitz teased about a "character getting resurrected" in the upcoming sequel.

Earlier, showrunner Guggenheim had revealed that White canary will be launched in the first few episodes. So there is a buzz that Sara Lance will get resurrected in the series.

However Lotz's character will not appear in the premiere episode as Pedowitz revealed that the resurrection will take place in the fifth episode of "Arrow" season 4.

The sequel titled "Haunted" is reportedly an important episode of the fourth season wherein actor Matt Ryan will reprise his role as John Constantine and play a major role in Oliver's life, according to Entertainment Weekly.

Another major character from the protagonist past will be played by actress Elysia Rotaru. "Oliver is gonna have a love interest in the past that will serve as a parallel or potentially a contrast to his love affair with Felicity in the present," informed Guggenheim.

Meanwhile, Malcolm Merlyn (John Barrowman) will face new challenges from Ra's al Ghul's daughter Nyssa al Ghul (Katrina Law) in "Arrow" season 4.

"I want to see that relationship explored, because her father is dead. The body is gone. We don't know. Will she look to Malcolm as being a role model? Will she always want to kill him? She has to respect him because he's part of The League, because one does wear the ring. I had to make me my own demon's head. And I've been wearing it for a week," the actor told Screen Rant.

The CW will air the premiere episode of "Arrow" season 4 on Wednesday, 7 October, at 8pm.