Credit: L: Frazer Harrison/Getty Images; R: Frederick M. Brown/Getty Images Photo: William Baldwin and Greg Grunberg

Small-screen vets Billy Baldwin and Greg Grunberg are set to get their tans on in the upcoming season of Hawaii Five-0.

The second-youngest Baldwin brother, who recently appeared on Gossip Girl and Parenthood, will play a former homicide detective spearheading a crime spree with a team of fellow corrupt cops. His most formidable foe will come in the form of his ex-partner (Tom Sizemore), who has risen to head of Internal Affairs. T-Size will do his damndest to put the cop-turned-con in jail.

Heroes alum Greg Grunberg will fall on the side of good, playing a Honolulu-based ICE (Immigration and Customs Enforcement) agent who is already familiar with Five-0's "unorthodox" style. Executive producer Peter M. Lenkov explained to TVLine, "His first exposure to working directly with Five-0 is when the team handles the murder investigation of an ICE Agent under command."

For those of you who miss Heroes, Lenkov has promised to "put [Greg] in a scene with Masi [Oka]." Squee!!

Don't miss the Season 2 premiere Monday, September 19, at 10/9c.

Sources: TV Guide, TVLine