Titus snoops on Erin at her office, believing that she is cheating on him. Erin is annoyed that Titus is at her office, not for snooping, but just for being there because of past problems. She doesn't want to keep getting embarrassed by him.
Fearing that Dad is dead, Dave calls for Titus to come by the house. Titus very quickly learns, though, that Dave does not actually know that Dad is dead. Dave fears for Dad's life because Dad has not left his room in four days. This particular fact does not surprise Titus. Dave further notes that Dad has apparently gone without beer during those four days. Now Titus is worried. No beer for four days? Dad must be dead. Suddenly a knocking at the door. Erin has rushed over to the house, for Dad is dead. Unfortunately . . .
Titus has urged Dave to move out for years now, as long as Dave doesn't move in with him. Finally, Dave has taken the plunge and moves out. Immediately thereafter Dad/Ken Titus has Dave arrested for taking some of the stuff from the house (including the VCR). Titus visits the jail holding Dave and tries to get him out. Titus then argues with his father, after Dad turns up, to drop the charges. Dave argues that the stuff is his, while Ken argues that no, the property belongs to him. A new problem develops when a particular item is revealed to be stuffed in the VCR.
Erin and Titus argue and say some things that both regret, and this argument causes them to break-up. Erin visits an ex-boyfriend, while Titus finds a willing woman.
Titus is doing well in his auto business, until pride gets in the way. A customer wants to add a wing to the car Titus has built, but Titus thinks it would look stupid and refuses to add the wing. His friends think Titus should add the wing because the company needs the money.
Titus tries to do right for his old man on Ken's birthday, so he takes the whole family to a nice place for a birthday dinner. On the way home, though, Titus gets involved in a little incident with a crazed motorist.
Titus's mom, Juanita, a paranoid schizophrenic known for her violent and bizarre antics, comes home, declaring that she's sane, which everyone (except Titus) believes.
Ken Titus is a mean angry man and drinks a lot. Then he stops drinking. After being without alcohol for a while, it is found that Ken is a lot better person drunk, than sober. He is annoying sober but without drive. The gang set up an intervention to get him drinking again, or Ken will be fired from his job.
Ken Titus has an accident in the car Christopher Titus worked on and ends up in the hospital. The gang rush to the hospital believing that he might have suffered another heart-attack. Evidence surfaces on a local news show that reveal the real story.
Following the events from "Episode Eleven", Titus tries to apologize to Ken for causing his heart attack, but Ken won't forgive him. What's worse, Titus hires a live-in nurse who instantly falls for Ken.
In the wake of Ken's heart attack, everyone donates blood and Christopher and Erin face the possibility of catching AIDS when they both confess that they didn't use protection when they had sex with other people during their temporary break-up.
Surprise parties tend to be a very dangerous idea around the Titus household, but despite that fact a new surprise party is held. To move Nurse Kathy into the Titus homestead.
Titus works on Ken's truck and receives some unexpected words. Words of praise. Titus is very suspicious.
The mental institution is holding a hearing on whether or not to release Juanita Titus, Christopher's mother. The gang try to keep mother Titus locked up, because they are too afraid of what might happen if she were to be let loose on the world.
Erin and Titus plan to wed. They also plan to reveal this great news to their families during the Thanksgiving dinner. Unfortunately, the Fitzgerald family is just as messed up as the Titus family and disaster looms, then erupts. Party moved to the hospital.
Tommy was quite hung up on a particular girl as he grew up, and he still "loves" her. Unfortunately, she sees him as nothing more than a stalker.
Titus shares a family meal with his parents, and his mother's new boyfriend. Both Ken and Titus are a little upset by the new boyfriend.
Titus has a secret. One that is both shocking and humiliating. It seems that he had an ex-girlfriend by the name of Noelle. Well, she's dead now and the family want him to come to the funeral. The horrifying secret is revealed.
Titus and gang attend an auto show to display one of their cards. Unfortunately, success goes to Christopher's head and he starts taking credit for everything. Dave and Tommy are not amused. Neither is Erin when she finds out Christopher wants her to put on a bikini to show off the car.
Titus and his friends go bridge-jumping with parachutes to get off on the thrill of excitement. But when Erin protests, Titus realizes that now that he has something to live for, he has second thoughts. Unfortunately, so does Erin.
Titus is honored when Ken asks him to be the best man at his father's wedding... until Kathy insists Ken give the honor to her father. When Kathy boasts at the rehearsal dinner that Ken is a new man because of her, Christopher has no choice but to play his father's DUI tape.
Business at the shop drops off when word of Christopher and Dave's fight at the auto show goes out. As the business goes downhill and Ken refuses to provide a loan, Christopher turns to alcohol.
After a bout with alcoholism following the events from "The Smell of Success", Titus and his friends decide to get Erin back from her loud, drunken, dysfunctional family, but the Fitzpatrick clan won't let Erin go without a fight.
Titus has to deliver a NASCAR race car to South Carolina, but refuses to take his father. Erin decides it's the perfect time for a father-son bonding experience... and tricks each of them into believing the other is dying of cancer.
Tommy tricks Christopher, Erin, and Dave into going to a self-help seminar led by Jerry October. Jerry soon helps Christopher and Erin to overcome their problems. But he'll need some self-help of his own when Ken Titus shows up to retrieve his son.
Titus has a new plan, a plan to fulfill one of his dreams. He's going to rebuild a funny car and race it to promote the shop. The only problem is that he needed to sell Erin's car to finance it.
Tiffany, Christopher's one-night stand during his brief break up with Erin, is back. This time, Tommy has decided to date her. She invites them all to her new restaurant, but Christopher thinks she's using Tommy to get back at him.
Titus meets Erin's niece, Amy, when Erin has her move in with them. When they find out Amy is selling marijuana, Erin and Titus disagree on parenting techniques.
Dave discovers a "Dear John" letter from his girlfriend Nancy and decided to join the Army. It turns out it's all a mistake... but now Christopher has to get his brother out of his enlistment contract.
Titus and Erin interrupt a burglar robbing their house. It turns out he's Erin's brother Michael, and if he gets arrested again he'll go to jail under the three strikes law. Erin doesn't want o see him go to jail and insists Christopher don't turn him in.
Titus High Performance goes to the drag races and attempts to win to promote the company and bring in business. When Ken wants to join the team to live out his dream, Christopher has him right where he wants him.
A disastrous racecar crash leaves Titus in a coma. After the doctor declares his son brain-dead, Ken declares that no parent should have to see his child that way, and quickly decides to pull the plug--despite the objections of Erin, Dave and Tommy.
Erin and Titus are getting married and think it will be safest if they have a private ceremony with none of their relatives. When Tommy blows their cover, everyone shows up and chaos ensues.
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.