Titus is walking wounded after his crash, and has to street race to make enough money to put Titus High Performance back on the map. When Erin finds out, they have to pretend Tommy can race but that doesn't last long.
Titus and the gang visit Amy's apartment for a surprise birthday party. When they discover her living in filth with an abusive father, Erin insists on taking her in. Christopher refuses and Amy isn't big on the idea either, so the two of them have to ally to convince a social worker that everything is fine.
Titus is determined to mend fences at a bar after Tommy rejects his father, who's just revealed he's gay--and things get worse when Titus's buddies beat up Tommy's father because of his homosexuality.
Titus' "perfect" sister Shannon arrives, upstaging Christopher at every opportunity--until Shannon's husband leaves her after Shannon announces that she's pregnant.
Erin tackles her first assignment as a social worker, trying to set up a case for a family of sociopaths headed by a pregnant girl who was raped by her father. Titus, who is concerned for Erin's safety rather than her chance to be successful, follows her to try and talk her out of it.
On Christmas, Titus, Erin, Dave, Tommy, and Amy set up a houseboat party for Ken and trick the bitter old man into getting in the Christmas spirit after they send Ken's drinking buddy on a boat and tell Ken that he stumbled off the boat and drowned.
Juanita's trial. The aftermath of the wedding that went wrong, and the abusive husband that had been killed by his wife, Juanita, results in this trial.
Titus always did like his Grandmother (beyond the fact that she dominates Ken Titus). Too bad she is dead, for he really loved her. What this, who is that strange old woman wandering the high school halls naked?
Amy is upset over a failed high school romance. Titus tries to comfort her by relating his crush on Erin while both were in high school, and how the path of true love never runs true.
Shannon and her husband broke up when he learned that she had tricked him into getting her pregnant. In the aftermath, Tommy finds himself a new girlfriend. Titus is annoyed.
The gang go skiing. Titus and Erin notice that Dave's girlfriend seems a little too friendly with the ski instructor, but Dave doesn't spot the clues. Christopher and Dave end up going off a cliff, and Titus realizes that he's protected Dave all of his life. He decides that Dave has to strike out on his own by rescuing them.
Titus is given a great opportunity. He is given the task of creating some car designs for Ford. He works very hard on these designs, but a little voice named Ken is bothering him.
Ken, Tommy, Dave and Titus are off for a weekend of gambling and fun in Las Vegas, for it is the Titus bachelor party. Erin begins to fear the worst when Titus doesn't call her.
Meanwhile, a woman tries to give birth in a diner, and the bachelor party members must try to help her before they continue on to Las Vegas.
Now that the shop is successful, Titus decides to try and impress Ken by taking him to the Bahamas. Ken would rather gamble, until he discovers that Erin brings him good luck at the blackjack table. She uses the opportunity to convince Christopher to treat his dad like a pal instead of a father. But when Ken has a heart attack and refuses to leave the tables, Christopher has a tough choice to make.
As part of a class project, Erin gets the family to attend a group therapy session. Things go horribly wrong . . . and Titus becomes both very embarrassed and very enraged.
Aftermath of the therapy session gone wrong. Titus didn't particularly like that experience and decides to get himself some revenge by humiliating Erin. His very elaborate plans involve a small cannon and some mud.
After seeing Tommy and his daughter Shannon dating, Ken decided to return the favor and date Tommy's mother. A different side of Ken is revealed, but then the situation turns weird when the gay father/husband shows up.
Despite supposedly being in a mental institution, Juanita visits Titus at a bad time. Titus and Erin are trying to adopt Amy, and a visit by an insane mother probably will not help their chances in adopting Amy.
Juanita's dead and the gang are on the flight back from her funeral. Tommy gets into a fight with the male flight attendant, while Dave acts his normal weird self. Meanwhile, Titus is slowly going insane.
The gang are interrogated by the FBI for their "attempted hijacking" of the plane in the last episode. After intensive interrogation, it is revealed both that Titus is "their leader" and apparently quite insane.
When Amy gets in trouble in school for beating up a boy, Titus and Erin come in to speak with the principal--which goes from bad to worse when the boy's father comes in and Amy recognizes him as the man who sexually molested her as a child.