A TRANSFUSION OF NEW BLOOD: Jessica Biel as archer Abigail.

Vampire hunter Blade (Wesley Snipes) faces his toughest adversary yet in this third and final installment (here’s hoping) of the series that has yielded diminishing returns since Stephen Norrington’s 1998 adaptation of Marvel Comics’ Blade became a sleeper hit. Misdirected by series scribe David S. Goyer, Blade Trinity is Blade versus the media. Or is it Blade versus the homeland-securing federal government? From the myriad threats teased (only to be forgotten) in the deceptively promising opening scenes emerges a rare instance of wit. Vampire Danica Talos (Parker Posey, preening as she makes fun of her dialogue) leads an expedition to Iraq, where she uncovers the ultimate WMD: Dracula. Savor the moment: " Drake " (Dominic Purcell), as he’s called, is no more threatening than your average club-garbed Eurotrash. Series newcomers Jessica Biel and Ryan Reynolds promise a transfusion of new blood to the undead undertakings as Abigail the archer and wise-ass ex-vampire Hannibal King, who make up the other two thirds of the title trio. Alas, Snipes sleepwalks through his role as a " daywalker, " and their efforts clot on this Blade. (105 minutes)