In a recent interview with Empire magazine, Steven Spielberg made it pretty clear that he wasn't 100 percent thrilled with the results of 'Indiana Jones and the Kingdom of the Crystal Skull.' Anyone who has followed the saga of the fourth Indiana Jones film since the release of 1989's 'Indiana Jones and the Last Crusade,' shouldn't be too surprised by this admission. As J.W. Rinzler's 'The Complete Making of Indiana Jones' illustrates, the reason that it took 19 years in-between films is pretty clear: George Lucas wanted aliens, and both Harrison Ford and Spielberg did not. The film went through multiple titles -- 'Indiana Jones and the Saucermen from Mars' and 'Indiana Jones and The Atomic Ants' being two of the more elaborate -- while, at almost every step, the project would get thrown off course by Lucas' insistence on aliens.