Warner Bros. has optioned all 22 novels in late American-Irish author Anne McCaffrey's Dragonriders of Pern series. With The Hobbit trilogy ending this year, this sprawling fantasy series could be a viable franchise replacement.The novels, which were first published in 1968, center on a group of warriors and their telepathic dragons who try to save their home planet of Pern from a deadly airborne threat, a rain of spores that hails from the orbit of the Red Star.