The Last Portal : By C.S.Einfeld & Aaron Einfeld (Paperback)

Elliot and Samantha Seaver think they're ordinary kids, but they're wrong. Not only do they come from a family of interstellar Superheroes but, thanks to a freak accident, they're now the most powerful beings in the solar system. They just don't know it, yet. Chaos, the evil Necrovore, is bent on devouring the Earth. He's killed Sam and Elliot's father, and now he's trying to kill their grandfather.Their only hope of rescuing him lies in using THE LAST PORTAL, a miraculous, alien device that oops! Sam's gone and broken. Somehow, Sam and Elliot must fix The Portal, rescue Grandpa, defeat Chaos, and save the planet, all before Mom figures out what they're up to.