Do you want to compare John Grey with Inertia? Discover the powers, weakness & weapons of John Grey and Inertia from John Grey Biography and Inertia Biography. Find out all about John Grey and Inertia.# Check out how is John Grey unique and distinct from Inertia. Discover their love interest, sidekicks, family tree and the movies and games list in which John Grey and Inertia have appeared. Find out everything about them here!