Dave is eager to take on a bigger role in the community and prove himself to Calvin; Calvin's reaction makes it clear that, while the relationship between the two families has grown, the friendship between Calvin and Dave needs more time.
When Grover gets into a fight with a bully at school, Gemma is torn between her role as principal and wanting to protect her son; Calvin encourages Marty to stand up to his own bully, only to be shocked when he learns who it is.
When Tina decides it's time to make home improvements, Dave volunteers to repaint the Butler house, violating Calvin's "man code" and setting off a chain of events that impacts both families.
When Dave accidentally knocks out the Butlers' power during a heat wave, Calvin and Tina spend the night at the Johnsons' home; Malcolm has some fun at Marty's expense when he crashes at his little brother's refurbished apartment.
The Butlers and Johnsons decide to go on a double-date and everyone gets more than they bargained for at a new restaurant. Also, Grover invites Malcolm and Marty to be the first guests on his new podcast.
Dave and Tina discover a common bond when they attend a concert together. Also, Gemma seeks the Butlers' help when an unwelcome visitor takes up residence in the Johnson home.
As Calvin and Tina near a milestone anniversary, Dave and Gemma decide to help the Butlers have the wedding they missed out on the first time around; Malcolm and Marty prepare an unforgettable performance for their parents' special occasion.
Calvin and Dave team up for a chance at bowling championship glory; Gemma and Tina face off against each other for the top ranking in an arcade game.
When Gemma sets a reluctant Malcolm up on a blind date with a teacher at her school, she discovers new details about the origins of her relationship with Dave. Also, Marty helps Calvin and Tina plan for their future.
Calvin reluctantly agrees to let Marty create a website for his auto shop in hopes of drumming up more business; Dave makes it his mission to prove to his son that there's more to life than his favorite gadgets.
When the Johnsons' Christmas present for Grover is stolen, Calvin and Dave team up to recover the gift in time for the holiday; a nostalgic Tina tries to get into the Christmas spirit by reviving traditions from when Malcolm and Marty were kids.
Dave's patience is tested when Gemma's freeloading sister suddenly shows up with plans for an extended stay; Calvin grows frustrated that Malcolm is still living at home.
Tina spends time with the charming new minister she helped select for her church; Calvin suspects the man may be coveting more than just job security; Marty gets a surprise when he finally meets his disruptive, new upstairs neighbor.
When Calvin and Dave get shown up by Gemma and Marty at a local bar's trivia night, the pair hatch a plan for a do-over to redeem themselves. Also, a frustrated Tina decides to take matters into her own hands in order to finally meet Malcolm's girlfriend, Sofi.
Dave puts his professional conflict mediator skills to the test when he offers to help Calvin find out why his employees are quitting. Also, Marty devises an elaborate plan to help him earn a date with his new upstairs neighbor.
After Calvin actually enjoys attending a hockey game with Dave, Malcolm and Marty wonder if their neighbor is rubbing off too much on their dad. Also, Tina decides to enjoy the perks that come with her "stardom" when she's mistaken for an A-list celebrity during a girls' trip with Gemma.
When Calvin decides to film a local TV commercial for his business, he enlists Dave, Tina and Marty to help, but it doesn't take long for creative differences to arise. Also, Malcolm considers making a grand gesture when his girlfriend, Sofia, is offered her dream job abroad.
When Grover joins Calvin's youth basketball team, Gemma finds herself at odds with some of her neighbor's coaching methods; Tina and Marty are forced to confront a long-buried Butler family secret.
When Tina receives unexpected news, Calvin, Dave and Gemma encourage her to embrace a new chapter by taking a big leap of faith - literally - by learning to skydive; Marty helps Grover create a battle bot for a school science competition.
A surprise delivery prompts Dave and Gemma, as well as Calvin and Tina, to examine the power dynamics in their respective relationships.
A near-accident awakens Dave's sense of civic duty, prompting him to team up with Calvin to try to improve the safety of their community. Also, a trip to the county fair turns into a nerve-wracking adventure for Malcolm, Marty and Grover.
Dave makes a run for city council, working hard to earn Calvin's support, only to have a controversial photo threaten to derail his entire campaign. Wayne Brady guest stars as longtime incumbent Isaiah Evans.