Little Sister

Bobby graduates high school with his friend Mike, marking the start of his transition to college life. His father hands him a book of romantic poems and urges him to forge his own identity. This gift foreshadows the thematic tension between tradition and self-discovery that drives the story.

In college, Bobby and Mike join a fraternity where the leader insists Bobby must teach pledges to be more like his father. The demand to emulate his dad creates internal conflict as Bobby seeks authenticity. The dynamic sets up the central comedy of misidentity.

At a party, Bobby tries to impress Sybil with his poems but fails to win her over. Meanwhile, he and Mike witness a heated break between Diana and her boyfriend Derry, who later reconciles with her. Bobby also begins to sense an opportunity to pursue Diana.

Diana’s breakup with Derry sets the stage for Bobby to pursue her, but she remains wary of his advances. Bobby juggles his growing interest in Diana with the expectations of the fraternity. The early romance threads drive the rest of his disguises and schemes.

Bobby discovers he’s enrolled in an all-female sociology of women in history class, while he and Mike also find out they’re in a taxidermy class by mistake. The mismatched courses push him toward a wilder plan to reinvent himself. The odd classes become the playground for his evolving Roberta persona.

The fraternity leader orders the pledges to steal a painting from the Zeta Alpha Zeta sorority house. After four failed attempts, Bobby disguises himself as 'Roberta' to fool the sorority sisters, though he cannot complete the theft. The plan exposes the fragility of his double life.

Maintaining the Roberta disguise strains Bobby, causing him to miss out on fraternity activities. Roberta is elected president of the pledge class, and Derry flirts with her, prompting Bobby and Mike to plot further mischief. The dual identity deepens the comedy and the romance.

During a study session with Diana in a thunderstorm, Bobby’s attempt to woo her back falters. Diana discovers his sorority scheme in the pledge book, sharpening her awareness of his deception. This moment pushes their relationship toward a crucial turning point.

Mike and Bobby devise a plan to catch Derry in a compromising moment, but the next day Derry reads notes in the library suggesting he take his clothes off, prompting Diana to break off their relationship. The botched scheme heightens the risk of exposure for Bobby's double life.

Bobby attempts to win Diana’s love again as Roberta, but a kiss while in normal clothes backfires, and she slaps him when he reveals his true identity. He ends the Roberta persona and steals the painting, which then raises suspicion of Roberta among the sorority sisters.

Mike arranges a Roberta–Wally date to keep up appearances while Bobby again chases Diana, but he ends up carrying encyclopedias for her. Diana finally explains the differences between them and hints she knows what he was doing—about Derry more than Roberta.

Bobby and Diana reconcile, while Diana nominates Roberta for sorority queen, forcing him to confront his dual identity. In the closing ceremony, Bobby, as Roberta, delivers a heartfelt speech, and his father visits to tell him he loves him. They end on a note of forgiveness, with the fraternity celebrating as Diana and Bobby reaffirm their relationship.