• "Legends of Tomorrow" is a spin-off series developed by Greg Berlanti, Andrew Kreisberg, Marc Guggenheim and Phil Klemmer.

"Legends of Tomorrow" is a spin-off series developed by Greg Berlanti, Andrew Kreisberg, Marc Guggenheim and Phil Klemmer. (Photo : Facebook/DC's Legends of Tomorrow)

New details for "Legends of Tomorrow" will feature Jonah Hex and Ra's Al Ghul in a new trailer, as well as the possible return of Hawkman and Heat Wave to the show.

A new trailer for "Legends of Tomorrow" has been streamed during the WonderCon event as the video features Rip Hunter (Arthur Darvill) and his team travel from different eras, the Old West and in the dystopian future where Vandal Savage (Casper Crump) conquered the whole planet, ScreenCrush reports.

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"Legends of Tomorrow" will return this week in episode 9 titled "Left Behind" were in Ray Palmer/The Atom (Brandon Routh), Kendra Saunders/Hawkgirl (Ciara Renee) and Sara Lance/White Canary (Caity Lotz) are stranded in the 50's as Chronos has taken over the Waverider and captured Rip Hunter, Leonard Snart/Captain Cold (Wentworth Miller), Professor Martin Stein (Victor Garber) and Jax Jackson (Franz Drameh). The new trailer sees Sara returning to the League of Assassin's and to train a young Nyssa Al Ghul under the orders of Ra's Al Ghul as Hawkgirl and the others saves Sara from corrupting her soul again.

Several scenes depicted the team in the Old West as encounter Jonah Hex (Johnathon Schaech), who happens to be Rip's old friend and is aware of his existence as a Time Master. The team also travels to the future as Ray Palmer encounters a young inventor Rachel Turner (Jewel Staite) who show's him a monument of himself in the future.

The Time Masters will also play a crucial role in the trailer as they have sent after an assassin to kill the younger version of Rip Hunter's team in the past starting with a young Sara Lance in Starling City along with a young Detective Quetin Lance (Paul Blackthorne). Vandal Savage will lead an army to conquer the world and Rip is prepared to kill a young boy who has a connection with Savage over the fate of the world. The trailer ends with Ray telling Jax to step back as he has upgraded his A.T.O.M. suite to go grow bigger, thus achieving a new power.

In other news, two members of Rip Hunter's team are hinted to return in several episodes of "Legends of Tomorrow" soon.

Executive Producer Marc Guggenheim told EnStarz during the WonderCon event that a character will be returning to show, but with twist because it involves time travel.

Two members of Rip's team Carter Hall/Hawkman (Falk Hentschel) and Mick Rory/Heat Wave (Dominic Purcell) are already gone in the show with Hawkman killed by Vandal Savage, while Heat Wave is stranded somewhere in time and possibly killed by Captain Cold.

Guggenhem explained that the show takes place over multiple time periods, so a character could be killed off tomorrow and then jump back in time and see them again before they die as interpretation of death in "Legends of Tomorrow" due to time travel.

"Legends of Tomorrow" will return on March 31 8pm on the CW Network.