Tru Davies accepts a job working the midnight shift at the city morgue. Then she discovers she can alter the events that brought these corpses to her grim attention. But replaying life isn’t as easy as it sounds. For one thing, people don’t always welcome help from a stranger who warns they’re about to die. For another, viewers may not be quick to swallow this deja-vu claptrap. And enough already, with her running through the streets to save the day ! We’re repeatedly told that Tru (Eliza Dushku) used to be a track star, but that doesn’t mean she should never get winded - or even sweat. "Tru Calling" premieres 8 p.m. Thursday on Fox. But even playing it back won’t change the ending : this show is doomed to be foolish.