Source: dc.wikia.com

9. Batman: In Darkest Knight

“…were Green Lantern?”

After almost getting killed fighting crime during Batman: Year One, Bruce Wayne sits in his study deciding what to do next. Then, a mysterious appearance.

It's not a bat smashing through the window, but a ghostly form that turns out to be Lantern Abin Sur, who has contacted Wayne to give him the power of the Green Lantern.

But when Sinestro appears seeking vengeance on the Green Lantern Corps, Bruce Wayne is there to face him. Unfortunately, Bruce is ill-equipped to deal with Sinestro, and he winds up appointing three new Lanterns (Clark Kent, Princess Diana, and Barry Allen) to watch Earth as he chases Sinestro to the stars for vengeance.

In Darkest Knight is a better idea than it is a story. The Green Lantern mythology is forced into the Batman mold, rather than informing the type of story being told.