Guardians of the Universe

The Guardians of the Universe do exist, but they are the Guardians from the Captain Comet series in the 1950s -- a bunch of tall, balding, green-skinned folk who find freelancers, like Captain Comet, to take care of emergencies throughout the universe.

Besides Captain Comet, a couple of the Green Lanterns have performed missions for them, as has Power Woman. They are also said to have worked with a Sorcerer Supreme or two.