Casey likes Derek's best friend, Sam, who has feelings for Casey too. Derek is opposed to a relationship between his best friend and his stepsister so he tries to sabotage the possibility of them coming together by informing Sam of the "Male Code", which says a guy's best friends cannot date their friends siblings (or step-siblings). Derek tries to break Casey and Sam apart but fails to do so.
- Michael Seater as Derek Venturi
- Ashley Leggat as Casey McDonald
- Jordan Todosey as Lizzie McDonald
- Daniel Magder as Edwin Venturi
- Ariel Waller as Marti Venturi
- Joy Tanner as Nora McDonald
- John Ralston as George Venturi