Leader-of-the-pack Laird loses his stud status when he learns his sperm count is low and Gracen's is high. Meanwhile Dougie is reduced to doing manual labor for Aubrey to score a spot in a pre-school, and Marmaduke navigates the modern day world of bartering.

Laird hooks up with his hot but crazy ex-wife, Joannifer, who disrupts all of the carpoolers' lives. Meanwhile, Dougie and Cindy decide to renew their wedding vows to wipe out the memory of their catastrophic first wedding ceremony.

The guys feel guilty but swear secrecy when they believe that a prank they pulled caused a rival carpool's car to catch fire. Meanwhile, Marmaduke's latest money making venture, an ATM machine that levies an $8.00 service charge, is cut short after being vandalized by unsatisfied customers.