Chris O’Dowd (Bridesmaids) stars in Christopher Guest‘s spring HBO series as a recently single and unemployed 30-something man who discovers himself by investigating his wacky extended family. Frequent Guest players Michael McKean, Fred Willard, Don Lake, Ed Begley Jr., and Jim Piddock (who co-wrote and exec produces the series with Guest) join Matt Griesser, Maria Blasucci, Amy Seimetz, Nina Conti, and Tom Bennett in the single camera docu-style series. Family Tree debuts in May on HBO and BBC Two in the UK. Here’s the show’s teaser:

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