Green Lantern, Vol. 2

Green Lantern is on his way to stop a sea creature from attacking the city, when he is pulled forward to 5700AD. Once there, his memory is wiped, so the residents feed him a false history before asking him to save them from the invading Zegors. He helps the future colony, and is returned to the moment in time he came from, with no memory of the adventure. Unfortunately, that means his ring has a one hour charge left, when Green Lantern is expecting a 24 hour charge.