HBO announced the casting of the former "Doctor Who" star today. Tennant will play Walt, a loving father who's nursing a "subtle but growing discontent," according to Variety.
Garner was previously cast as Kathryn in the eight-episode series, who is, as her character description goes, "far less cheerful than her Lululemons imply."
Instead of following 20-something New Yorkers, the half-hour comedy will focus on uptight 40-something Angelenos. Everything goes awry -- including woman on woman" crime -- when a group of friends go on a camping holiday to celebrate Walt's 45th birthday.
The HBO series is a remake of the 2016 British comedy of the same name, which was created by actress-director Julia Davis.
Tennant also stars in the upcoming fantasy series "Good Omens."