My Gym Teacher Is an Alien Overlord — David Solomons

When Luke's annoying older brother became a superhero instead of him, Luke thought he couldn't get any more disgruntled-- until his friend Lara became a superhero, too. Now Luke's feeling totally left out; even his best friend gets mad at him when Luke's attempts at crime-solving without superpowers go terribly awry. So when Luke discovers an alien plot to overthrow the world, he's got nobody to turn to who'll listen...nobody but his sworn enemy. In this hilarious sequel to My Brother is a Superhero, Luke will have to put on his big-boy Daredevil underpants and find out what heroes and villains are truly made of.