Journeyman was one of a slew of vaguely sci-fi TV shows that the major networks--NBC, in Journeyman's case--put out last fall to try and capitalize on the success of shows like Heroes and Lost. Journeyman was about a reporter named Dan who, for some unknown reason, suddenly started flashing back in time. He quickly realized that he had vaguely defined "missions," for lack of a better word, to complete in the past in order to get back to his own time.
The concept is not exactly new in sci fi TV, but the presentation was better than most. It was a very character-driven show, with Dan acting logically, unlike so many other reluctant heroes, and actually telling his wife that this freaky-ass thing just happened to him. She doesn't believe him until he finds a way to prove it at the end of the first episode. Even after she realizes it's true, his "traveling" (as the show calls it) puts a strain on their marriage and the raising of their son. Further elements from Dan's past complicate matters even more. Also, Dan starts trying to uncover the nature of his traveling after learning that he's not the only one capable of it. Meanwhile, Dan's brother, who's a cop, starts worrying that something's going on with Dan because of his frequent absences, weird questions and requests, and general flakiness and basically starts to investigate Dan. They, of course, butt heads because Dan's brother doesn't believe Dan when he comes out and explains things, and Dan and his brother have an already strained relationship that further complicates things.
Basically, the hook was interesting in a Quantum Leap-ish sort of way, but it took things way beyond QL and focused a lot more on the characters and the emotional, professional, and personal toll this kind of weird time-jumping would believably bring to a person's life.