Mike and Molly gather with family and friends for a momentous occasion and reminisce about everything that led to this point.

Joyce conveniently disappears after a back injury renders Vince practically immobile, and that leaves Mike and Molly to take care of him. Meanwhile, the newlyweds are still laboring over personalized thank-you notes for their wedding presents.

Molly brings home a pregnant former student she discovers is homeless.

Peggy makes Molly do chores in exchange for sharing tantalizing stories from her past for Molly’s second book.

Two days before their wedding, Mike and Molly arrange their wedding rehearsal which turns into a disaster.

When Molly gets a cold before her first date with Mike, she takes cold medicine to feel better.

Mike and Carl go to couples counseling to try to reconcile their partnership. Also, Molly decides to do a promotional radio interview on her own after Peggy decides not to participate.

Mike blames Molly for Peg's heart attack following a heated argument and now Molly wants to make amends.

Mike is upset when Vince bails on finishing a Do-It-Yourself project they started together.

Mike and Molly need everyone to be on their best behavior when the adoption agency schedules a home visit.

Mike and Molly have to deal with several problems as they make their way to the altar.

Mike is forced to set up his mom with his boss, despite his many reservations.

Mike is forced to arrest Joyce for a DUI after she refuses to take a breathalyzer at a checkpoint.

Molly surprises Peggy by reuniting her with her estranged sister, Rosemary, when they take a road trip to Peggy’s hometown of Mudlick. Also, Vince and Mike experience father-son bonding when they work together to fix the water heater.

Carl convinces Mike to go with him to see his psychic and Peggy drags Molly to her church to pray for something they’ve all been waiting for,

Mike turns Molly down when she invites him in after a date.

When Mike's overbearing mother buys Molly a new hat as a gesture of goodwill, Molly feels obliged to invite her to spend Thanksgiving with her family.

Molly and Joyce ask Mike for help when Victoria is arrested for a number of driving violations.

Molly has a “mind-blowing” experience when she goes to Victoria’s workplace, a funeral home, to research her novel. Meanwhile, Mike sneaks a peek at Molly’s writing when she’s out.

Samuel wants to be a standup comic; Molly offers advice to Harry which leads to him challenging his protective mother.

Mike, Samuel and Carl go on a road trip to Memphis, Tenn., to meet Carl's mother.

Guilt sets in for Mike when he flirts with a rookie cop and she reciprocates.

Mike is forced to uninvited Carl to his anniversary cruise after Carl’s nasty break-up with Victoria.

Molly gives Mike a device that will track his activity in hopes of helping him get healthier and take better care of himself, but Mike has other plans.

When Mike and Molly realize Frannie (Juliette Goglia) doesn't have a plan in place for after the baby is born, Molly decides to help by reuniting her with her estranged sister, Maura (Jessy Hodges).