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Sanaa Lathan and Jonathan Groff will be regulars on Starz’s drama series, Boss, Deadline reports.

The 40-year-old actress and the 28-year-old Glee actor will appear in the second season of the series, which centers around Tom Kane (Kelsey Grammer), the mayor of Chicago who’s been diagnosed with a degenerative neurological disorder.

Sanaa is set to play Mona, the mayor’s incorruptible new chief of staff, who becomes an obsession for him.

Jonathan will play Ian Todd, a smart and ambitious staffer in Tom’s office who steps into the void Ezra Stone (Martin Donovan) has left to offer astute council to Kane.