Showtime says it has cast film and television star Joshua Jackson in its New York-set drama pilot "The Affair."

Jackson joins previously announced cast members Dominic West, Ruth Wilson and Maura Tierney.

Jackson will play the role of Cole, a "hard-edged cowboy who manages a ranch on the eastern tip of Long Island that has been in his family for generations," a synopsis said.

"Cole is married to Allison [played by Wilson,] a young woman, working in a pancake house, trying to piece her life back together in the wake of a tragedy. Their emotionally charged marriage becomes even more complicated when Allison begins an affair with Noah [played by West,] a New Yorker who is spending the summer with his family out on the island."

Tierney plays Helen, Noah's "college sweetheart, best friend, mother of his children, lover and wife of 17 years, whose world will be buffeted by Noah's infidelity and who, over time, will swing back and forth from understanding to furious, and from forgiving to vengeful," the synopsis said.