S4, E4: Beaver goes to class to find he got an F on his paper because it‘s plagiarized. He‘s needs to write a decent, original paper by the next morning or the F stays on his record. Casey talks with Katherine in hopes of forming a study group with her, but Katherine says she doesn‘t like study groups. Beaver meets Katherine, and is instantly smitten. Rusty and Dana are working on a science project together, and Ashleigh joins in to help make their slideshow more presentable. Dana requests to be called a co-inventor on the credits page, but when Rusty finds out, his anger ruins the presentation. The committee likes the invention, but pulls Rusty from the project and gives it to a professional team. Rebecca invites Cappie to the pledge party so she can make Evan jealous. Casey and Beaver team up in search of case summaries for Casey. Beaver accidentally invites Katherine along as they search for notes, much to Casey‘s dismay. Katherine finds out that Casey is looking to buy study notes, and Katherine admits she needs help as well. They form a study group, and Beaver gets help from Casey on his paper. Beaver wakes up in bed with Katherine. Rusty and Dana break up.