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Mike's family responsibilities have left him with no time for himself. Adam and Callie move in together and discover the differences from just spending the night.

Mike and Ethan give Adam grief over his patented move regarding stuffed animals. Lisa tries to win a charity tennis tournament with a former girlfriend of Ethan's, but the plan backfires.

Mike is reluctant to mentor a young woman but is encouraged to by Lisa and is surprised how well they get along. Adam's lone alone time on his morning commute is invaded by Callie.

Adam discovers that Callie is deep in debt and doesn't seem to care; Mike switches with Lisa on morning baby duties and bonds with the other neighborhood mothers. Ethan tries to break up with a girl but she sees his bluff.

Callie seeks to return a lost puppy but Adam gets the credit; Mike confronts a noisy neighbor; Ethan's current girlfriend meets his shut-in neighbor in person.

Adam borrows Callie's car and allows it to be stolen. He decides to surprise her with a new one and asks the guys to help get the best deal.

Mike hosts a barbecue to celebrate Lisa's promotion; Adam has proximity issues with his daily business; Callie's sister is an emotional mess and looking for relief.

Callie's sister is driving Adam and Callie crazy, and Callie has Adam get her a job where he works. Predictably, the situation worsens when she starts fooling around with Adam's boss. Ethan saves Lisa's life, and Mike seeks a way to pay him back.

Lisa gets assigned a project that takes her out of town with an improper co-worker, so she recruits Callie as a photographer to hopefully curb his behavior. Adam takes advantage of a work assignment to make up for ruining Mike's original bachelor party, but he soon loses control of the party.

Mike and Lisa ask Adam and Callie to watch Tommy so they can have a night to themselves. Adam tries to curb Callie's quick temper. Ethan thinks he has found his soulmate.

Mike and Lisa use various methods to to keep track of each other's location. Adam gets an assignment to write an article about intimate behavior, but Callie misunderstands when she sees his research material. Ethan makes extra money delivering human organs until he loses a delivery.

The guys decide to go hunting for their annual guys trip. Lisa wants some photos taken of Tommy but when Callie volunteers, their friendship is challenged over Callie's bill.

Mike objects to the attractive babysitter that Lisa hires. Adam and Callie fight over her habit of going nude in the privacy of their home, and it is magnified when the guy Adam hires to fix their computers accidentally sees her naked. After Ethan is convinced to get rid of his lucky necklace, he loses his touch with women.