Claire Danes & Richard Gadd

Claire Danes and Richard Gadd both flirted with madness in high-profile acting duets this season. On "The Beast in Me," veteran actress Danes played writer and grieving mother Agatha Wiggs, whose journalistic instincts get tripped by her new, threatening neighbor (Matthew Rhys). And on "Half Man," writer-director-star Gadd's followup to the sensation "Baby Reindeer," it's Gadd who plays the threat as Ruben, a musclebound tough guy who haunts the life of his childhood acquaintance Niall (Jamie Bell) into adulthood.