Infinite DC: Galaxy Defenders

In one night, Beauregard "Beau" Donahue's life changed when he helped a stranger...one who claimed to be a time traveler who journeyed in a strange black monolith. Three years later, Beau believes the entire night to have been a dream...or, at least, he thought it was...until the same black monolith returned...and a different stranger has emerged from it. Now, young Beau finds himself tailed by a pair of secret government agents who are pursuing his new friend: Kara, the Thirteenth Gladiator of Gallifrey. All the while, he must protect a girl who barely knows he exists from the threat of an alien hellbent on destroying the universe.