Fred Willard Fred Willard

It's a reunion for Fred Willard, Michael McKean and Ed Begley Jr. who have all joined Christopher Guest's upcoming HBO series, according to The Hollywood Reporter.

The mockumentary-style series, called Family Tree, stars Bridesmaids' Chris O'Dowd as Tom, a 30-year-old who begins researching his family history when he inherits a strange box full of unusual stories from the past.

HBO orders new comedy series from Christopher Guest

Begley Jr. will play Tom's Uncle Andy, Willard will play Andy's neighbor Mike and McKean will play Tom's father Keith. All three actors have appeared in numerous Guest films including For Your Consideration, Best in Show and This is Spinal Tap.