Despite symptoms of sequelitis, "Austin Powers in Goldmember" is must-see lunacy for devoted fans of the shagadelic franchise. Unfortunately, the law of diminishing returns is in full effect: for every big-name cameo and raunchy double-entendre, there's an equal share of redundant shtick, juvenile scatology, and pop-cultural spoofery. All is forgiven when the hilarity level is consistently high, and Mike Myers--returning here as randy Brit spy Austin, his nemesis Dr. Evil, the bloated Scottish henchman Fat Bastard, and new Dutch disco-villain Goldmember--thrives by favoring comedic chaos over coherent plotting. Once they've tossed Austin into the disco fever of 1975 (where he's sent to rescue his father, gamely played by Michael Caine), Myers and director Jay Roach seem vaguely adrift with old and new characters, including Verne Troyer's Mini-Me and pop star Beyoncé Knowles as Pam Grier-ish blaxpo-babe Foxxy Cleopatra. A bit tired, perhaps, but Powers hasn't lost his mojo. "--Jeff Shannon"