WATCH: Bill Hader Shares His Impressions Of Harry Styles, Seth Rogan & More On ELLEN

Comedian Bill Hader is known for his impressions, so Ellen put him to the ultimate skills test when he visited the show. Watch the clip here:

Hader will be hosting SATURDAY NIGHT LIVE this weekend on NBC. He is also starring on the upcoming HBO comedy series BARRY.

Barry is a depressed, low-rent hitman from the Midwest. While on a job in LA, he follows his "mark" into an acting class and is instantly drawn to the group of students. Barry wants to start a new life in this community of eager hopefuls, but his criminal past won't let him walk away. Can he find a way to balance the two worlds?

The dark comedy series BARRY, starring Bill Hader, kicks off its eight-episode season SUNDAY, MARCH 25 (10:30-11:00 p.m. ET/PT) on HBO. Alec Berg (HBO's "Silicon Valley") and Hader ("Saturday Night Live") serve as co-creators, executive producers, directors and writers.

Other cast regulars include: Stephen Root ("Get Out") as Barry's handler, who is alarmed to contemplate a future without his primary source of income; Sarah Goldberg ("Hindsight") as a dedicated acting student who becomes the object of Barry's affection; Glenn Fleshler (HBO's "True Detective") a Chechen mob kingpin whose killer instincts are (somewhat) tempered by a surprisingly sentimental side; Anthony Carrigan ("Gotham") as the mobster's brutal but unfailingly polite sidekick; and Henry Winkler ("Arrested Development") as a pompous yet endearing acting teacher who takes Barry under his wing.