Season 4

01 Two Kisses One Party Episode 119th July 2008 Derek refuses to help out with Marti's birthday party despite being asked by Sally. Casey wants to get back together with Max, but he is hesitant about the whole idea. 02 Open Mic Plight Episode 227th July 2008 After Derek has trouble expressing his feelings for Sally, she recommends that he write a love song for her. Meanwhile, Edwin tries out his talent show comedy routine on George and Lizzie. 03 Just Friends Episode 312th August 2008 Even though Sally had one friendly dinner with her ex-boyfriend, an irritated Derek decides to spend time with Kendra to make a point that girls and guys can't be just friends. Casey attempts to counter Derek's argument by searching for a male student that she can be friends with. Meanwhile, Edwin fears that George's female co-worker who is coming over for dinner is out to steal his father away from Nora. 04 March Break Episode 426th August 2008 While the rest of the family heads off to Quebec for spring break, Casey and Derek decide to stay home to meet their previously planned engagements. However, the two discover that they now have to spend the entire vacation together when their original plans don't work out. 05 6 1/2 Episode 54th November 2008 Casey is hurt by the six and a half out of 10 that she receives from a new guy at school who starts ratings girls, and whose ratings Kendra plans to use in selecting models for an upcoming fashion show. 06 Derek Denies Denial Episode 612th September 2008 Derek breaks up with Sally after she reveals her plans to attend a university in another province. Believing that he is hurt over what happened and is bottling up his feelings, a concerned Edwin and Casey try to get him to open up. Meanwhile, Lizzie and Marti attempt to keep a dog hidden from most of the family. 07 Happy New Schoolyear Episode 77th October 2008 Derek plans to drop of out of school to be with Sally in Vancouver. 08 No Secrets Episode 828th October 2008 Casey is in panic mode after the diary that details her unsettling romantic dreams about Truman goes missing. Believing that Derek and Edwin took it, Lizzie and Marti attempt to get the diary back by making their stepbrothers' lives miserable. 09 Take A Stepkid to Work Day Episode 911th March 2009 Casey spends the day with George at his law office where her need to organize things doesn't mesh well with the way he usually does things. Meanwhile, Derek tries to help Nora land a business deal with a client. 10 No More Games Episode 102nd December 2008 Casey gets stuck with Truman as her fencing partner in gym. Meanwhile, what starts out as a friendly game of table-tennis between Derek and Edwin turns into an ongoing competition to figure out who is the best player. 11 How I Met Your Stepbro Episode 112nd December 2008 As George prepares a Mexican fiesta for their second wedding anniversary, Nora gets a reluctant Casey to tell the story of how she and Derek first met. 12 Casey & Ralph?! Episode 1216th December 2008 While his parents are away for the weekend, Ralph stays at Derek's home where he begins to develop a crush on Casey. 13 Tuesday Afternoon Fever Episode 1330th December 2008 After entering a tv dance contest, Casey must find a new dance partner when the previous one pairs up with her rival. Meanwhile, Lizzie dares George and Edwin to eat only healthy food for a week. 14 Teddy's Back Episode 1418th November 2008 A surprise visit from Edwin's friend Teddy turns into a frequent occurrence that makes the entire McDonald-Venturi household uncomfortable. Despite warnings from Emily, Casey decides to go out on a date with Truman. 15 Rude Awakenings Episode 154th March 2009 To be eligible for college athletic scholarships, a "D" average Derek seeks George and Edwin's help in passing all of his final exams. Meanwhile, Nora and the girls try to get a stressed out Casey to stop over-studying and relax. 16 Truman's Last Chance Episode 1618th March 2009 Derek serves as a chaperone for Casey who is going to a party in Toronto with Truman. Meanwhile, Lizzie goes out on a date with a boy that the family has never met. 17 Surprise! Episode 1725th March 2009 As the prom approaches, Casey and Derek both find themselves without a date. Meanwhile, George and Nora have something to tell the family. 18 Futuritis Episode 1825th March 2009 A worrisome Casey is having difficulty writing her valedictorian speech for graduation. 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.