Writing high concept sci-fi, with its vast potential, can be a challenge to pin down into a cohesive narrative. One false move with jargon or a rant, and you can lose your casual reader, sucked into a void never to be seen again. With “Gonzo Cosmic,” a new comic book series, Garry Mac has created something with plenty of twists and turns but with a solid narrative and cast of characters that will keep you grounded and, more to the point, hooked.