Star Trek / Green Lantern: The Spectrum War is a graphic novel which is exactly what the title says, an improbable crossover between the rebooted Star Trek and the Green Lantern universe. Go ahead and snicker. It was fun.
In a future/alternate GL timeline, Nekron, the creator of the Black Rings, somehow manages to kill most of the members of the various Lanterns Corps. Ganthet pulls off a trick to use his death's energy to send the various rings into another universe, specifically the one populated by our rebooted Enterprise crew. The Enterprise crew find his body about the same time Hal Jordan finds them (the green ring was curiously missing from Ganthet's collection). The rings get activated and three Enterprise crew members get chosen while the yellow, red, and orange rings fly off to find appropriate Star Trek universe counterparts.
The yellow ring chooses one of my favorite Klingons, General Chang, who is sadly underused in this book. The red and orange rings choose some random characters they created for this book. Don't bother getting invested in them. Grumpy McCoy gets indigo (I love his reaction to the ring picking him.), while Uhura becomes a Star Sapphire, of course. *sigh* My favorite choice is Chekhov. He gets chosen by the blue ring. "I can do zat!" He does embody hope.
Anyway, Nekron pops up again and the new Lanterns have to join up with the old Lanterns that actually managed to survive and get pulled from their universe to ours. Yes, I consider Trek to be my universe. I can hope, can't I? Each of the Corps has at least one that survived. They each find their counterparts and things go from there. Oh, did I mention that Nekron has found the perfect place to rouse an army? It's the asteroid cluster formerly known as Vulcan.
This was only a six part series, so it wasn't really long or in depth. It was fun, though. Kirk and Jordan are too much alike to actually get along well at first, but when faced with impending doom our heroes manage to rub along well enough. Kirk figures out the way to beat Nekron, in an interesting twist. Don't take this book seriously. It's fluff and wish fulfillment, just like the Star Trek / Doctor Who crossover.