Scott Bakula ("Quantum Leap") will guest star as Chuck and Ellie's estranged dad on NBC's action-comedy series "Chuck" (Mondays, 8-9 p.m. ET) in a multi-episode arc scheduled for broadcast later this spring.

In the storyline, Chuck made a promise to his sister, Ellie that he was going to find their dad in time for her wedding. But when he does find him, Chuck discovers that his dad is not necessarily a guy who wants to be found. He's living in a trailer, he's disheveled, he's paranoid and he's claiming constantly that Ted Roark (guest star Chevy Chase) -- who he used to work with -- stole all his ideas from him. In addition, Ted Roark has now become a super-successful software billionaire while Chuck's dad has become an eccentric, living in the shadows.