SERIES FINALE: After eight years and 121 episodes, Psych calls it quits, serving up a finale that promises to provide a clear conclusion, while leaving room for a reunion down the road. And down the road turns out to be a destination that arrives immediately: Right after Psych concludes tonight, USA presents a post-show special, reuniting the cast and creator on live TV, called Psych After Pshow. How Psweet.