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It's the wedding anniversary of rugged Cleveland police detective "Big Bob" Carter and his chatty wife Ethel and to celebrate, Bob's asked his extended family to cruise to California with them, hoping the joys of the open road might help fuse their frayed connections. No one is particularly happy about it. Eldest daughter, Lynn, worries about her new baby's safety and comfort while her husband, mild-mannered tech geek, Doug, worries about close encounters with his father-in-law. Meanwhile teen daughter, Brenda, detests the idea of leaving her friends for a family bonding trip, while young prankster Bobby is anxious to entertain the family's two German Shepherds, Beauty and Beast. Nevertheless, the entire clan piles into a weathered Suburban pulling Bob's beloved '88 Airstream trailer and heads west. Then, Big Bob takes a detour. Suddenly, the Carter family finds themselves in a desolate stretch of desert, with nothing seemingly alive for miles.