VIDEO: Sneak Peek - Sean Hayes Guests on Tonight's SMASH

Sean Hayes guest stars on tonight's episode of NBC's SMASH titled 'The Read-Through.' In the episode, Ivy (Megan Hilty) realizes her triumph might not be all she hoped when she meets her new co-star, Terry Falls (Hayes) and Julia's (Debra Messing) fears increase when Tom (Christian Borle) airs his suspicions of Peter (guest star Daniel Sunjata).

Meanwhile, Jimmy (Jeremy Jordan) and Kyle (Andy Mientus) confront their own crisis of confidence as "Hit List" is read for the first time and Karen (Katharine McPhee) wonders if she can trust Jimmy. Anjelica Huston, Jack Davenport and Krysta Rodriguez also star. Daniel Sunjata and Nikki Blonsky also guest star. The episode airs tonight Tuesday, March 5 at 10:00 pm on the NBC network. Check out clips below!

Hayes, who received critical acclaim for his roles in theater, television and film, quickly gained fame as the sarcastic and hilarious, Jack McFarland, on NBC's "Will & Grace." In addition to working successfully and simultaneously in theater, film and television, Hayes has also added producing to his repertoire, including NBC's sophomore drama series "Grimm."

He became a household name in 1998, when he landed the coveted role of Jack on "Will & Grace." His portrayal garnered him an Emmy Award (along with six nominations), four Screen Actors Guild Awards, and received seven Golden Globe nominations. Hayes' other notable television projects include well received guest roles on "Scrubs," "30 Rock" and "Parks and Recreation," as well as "Martin & Lewis" a television film that starred Sean as Jerry Lewis for which he earned a Screen Actors Guild Award nomination.

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