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'Crisis on Infinite Earths' could see John Diggle briefly become Green Lantern, but can the character spawn a spin-off show?

The CW's last major crossover 'Elseworlds' revealed that in at least one parallel world John's last name is Stewart, and he is the iconic Green Lantern of Earth

With 'Arrow' coming to an end after its upcoming eighth season, The CW has some space for a new Arrowverse series and the network is reportedly looking at multiple projects that could take the popular show's spot.

One character that fans would love to see expanded on in a spin-off series is John Diggle (David Ramsey), the trusty partner of Stephen Amell's Oliver Queen/Green Arrow. The CW's last major crossover, 'Elseworlds', revealed that in at least one parallel world, John's last name is Stewart and he is the iconic Green Lantern of Earth (or Space Sector 2814 for die-hard GL fans).

"They continue to tease this thing... I don't know what's gonna happen with that," Ramsey revealed, according to Digital Spy. "It's fun to tease it and I would love to jump into that mythos of John Stewart and Green Lantern, that whole universe."

Unfortunately, it's going to take a lot of work to bring a Green Lantern show to screens as the visual effects alone would cost a fortune. It might be possible to develop a show that places John in a buddy-cop capacity with one of the other Lanterns of Earth—Hal Jordan, Guy Gardner, or Kyle Rayner. However, that wouldn't give the show the grand space opera-like setting that is central to most Green Lantern stories. 

That's not to say the character has no future in the MCU. It's perfectly likely that John, or rather the version of him who is a Lantern, could make an appearance during 'Crisis on Infinite Earths', the next massive crossover event that's coming to the Arrowverse.

'Crisis' will see the heroes of 'Arrow', 'The Flash', 'Supergirl', 'Black Lightning', and 'Batwoman' join an army of heroes from past shows and movies to go up against the Anti-Monitor (LaMonica Garrett). Considering the cosmic-level threat that they are about to face, the Arrowverse heroes could probably use some extra firepower in their corner and Green Lanter, DC's premier cosmic hero, can provide plenty of that.  

'Crisis on Infinite Earths' will begin with an episode of 'Supergirl' on December 8 and have one episode each on 'Arrow', 'Batwoman' and 'The Flash' before ending over on 'Legends of Tomorrow' on January 14.