Kathryn Erbe and Vincent D'Onofrio Kathryn Erbe and Vincent D'Onofrio

Wine tasting is about to go sour on this Sunday's Law & Order: Criminal Intent.

"We have to figure out how the multi-millionaire who bought one of the most expensive wines in the world ends up dead in his wine cellar," star Vincent D'Onofrio says of the episode, airing at 9/8c on USA.

Exclusive: Adrian Pasdar, Bryan Batt to guest-star on Law & Order: Criminal Intent

Mad Men alum Bryan Batt and former Heroes star Adrian Pasdar will guest-star in the episode as two possible suspects. Pasdar plays wine buyer and philanthropist Mason Kent, whose on-screen digs (read: a castle complete with a full suit of knight's armor) provided a great opportunity for the actors. "We were trying to invent stuff on the fly and have lighter moments in the scenes that turn heavy," D'Onofrio says. "Trying to mix it up a little bit. We were having a blast."

Watch an exclusive behind-the-scenes look: