Every family has its squabbles, but when the relatives are a race of powerful deities, things can get out of hand. "Wrath of the Titans" imagines a multigenerational tag-team match between the half-human demigod Perseus (Sam Worthington), his feuding father, Zeus (Liam Neeson), and uncle Hades (Ralph Fiennes), and their father, the primordial titan Kronos (a mountain-sized humanoid mass of special-effects smoke and lava). Though the film shortchanges us on the promise of its title, providing only one titan, it is overkill in most other regards. Having limbered up by demolishing Southern California in "Battle: Los Angeles," director Jonathan Liebesman obliterates ancient Greece in a chain of combat and action scenes of thermonuclear proportions. Like Michael Corleone in "Godfather III," just when Perseus thinks he's out of the family business, he gets pulled back in. Having defeated the fearsome sea monster Kraken...