Marti is turning eight and wants to have a party with all her friends, but it's almost canceled when Nora has to go to Toronto to visit her aunt who just broke her hip. Sally volunteers herself and Derek to plan and host the part.y. Derek and Sally get in a fight when he refuses to help her.
Meanwhile Casey is finding it hard to get over Max and thinks they should get back together.
Derek convinces his boss to have an "Open Mic Night" at Smelly Nelly's with D-Rock playing and Sally as the MC. Sally tells Derek how she feels about him and is disappointed that he doesn't tell her anything back. Derek has trouble saying how he feels so she tells him to write a song about them, much to his dislike. Now he must turn to Casey to help him write a song.
Meanwhile Edwin decides to sign up for
Open Mic Night" telling jokes but realizes that none of his jokes are actually funny.
Derek is upset that Sally continues to hang out with her ex-boyfriend Patrick. Derek believes that guys and girls cannot be friends, it always leads to something more. So in attempt to make her jealous he calls Kendra and asks to hang out with her on Saturday. Casey thinks Derek is being ridiculous to believe that guys and girls cannot be friends so she starts hanging out with Noel, who in turn thinks that she likes him back.
Meanwhile George has a new friend at work named Terry who just so happens to be a girl. Edwin is worried that Terry has other motives for being George's friend and wants to break up his marriage.
It's March Break and George wants to go on a family road trip twelve hours away from home. Derek and Casey don't want to waste their vacation with the family and decide to stay at home, which leads to an all out war.
Songs: Say When -- Whoa
There's a new guy at school who decides to rate all the girls. Casey finds out that he only rated her a 6 1/2 out of 10 and is upset. Kendra decides to use the ratings the new guy gave the girls to select models for a fashion show.
After breaking up with Sally when she tells him she is going to an out-of-province university, Derek denies that he is upset about the break-up.
The new school year is about to start and there's chaos in the Venturi-McDonald house. Casey wants to find a new identity and redo her room, Edwin is heartbroken after Michelle breaks up with him, Lizzie is sick of her clothes, Marti refuses to leave her tent in the hallway and Derek wants to drop out of school to live near Sally in Vancouver.
Truman keeps asking Casey out and every time she says no, as a result she has been having dreams about him. Meanwhile Edwin starts snooping on the McDonad's and Casey's dream diary goes missing.
It's "Take Your Child to Work Day" but the Venturi-McDonald house is doing it a bit differently. Instead it's called "Take Your Stepkid to Work Day" and Casey will go to work with George while Derek goes to work with Nora. Meanwhile Edwin fakes sick to stay home with Lizzie and Marti who are actually sick.
Casey is stuck with Truman as her fencing partner in PE. Meanwhile, George buys a ping pong table and it puts Edwin and Derek to be in competition with each other.
It's George and Nora's two year wedding anniversary and George has thrown the family a Mexican fiesta. Nora decides that its time the family learns about Operation Disengagement, Derek and Casey's plan to break up George and Nora.
Casey agrees to go out with Truman but things don't go exactly as planned. Meanwhile, Edwin's friend Teddy returns and won't leave the Venturi-McDonald family alone. While everyone else wants him to leave, Derek decides to take him under his wing and George is away on a business trip.
As Prom approaches the Venturi household is full of surprises Derek announces a new love, Casey gets back with an old love, and Nora and George announces the biggest surprise of them all to the family.
As graduation day approaches, a worried Casey is having difficulty writing her valedictorian speech, which she blames on her fear of Derek pulling a prank and ruining it until Derek points out that she's actually afraid of what the future holds. Meanwhile, Edwin is concerned that he won't be able to live up to Derek's reputation at J.S. Thompson High when he goes there in the fall. The family celebrates Casey and Derek's high school graduation and the two make a very awkward announcement: that they are going to the same university.