Theresa Keiner (TK): Harley’s Sister from Boy Meets World

Theresa Keiner is a Boy Meets World character and the younger sister of Harley Keiner. She appears in Season 2, Episode 10: Sister Theresa, where she dates the show’s principal character, Cory Matthews.

Theresa, also known as “TK,” dates Cory Matthews during her lone appearance, indulging her newfound love interest with excessive gestures like sending flowers and steaks to his residence.

Relation to Harley Keiner

If Theresa’s last name sounds familiar, it’s because she is the younger sibling of one of Season 2’s recurring characters, Harley Keiner. Since Theresa is often referred to by her initials (TK), several John Adams High School students are initially unaware of her relation to Harley, including Cory.

Harley is Theresa’s primary guardian in a toxic family dynamic. Theresa and Harley’s father is a deadbeat who left her stranded at a Philadelphia Phillies game as a child. As a result, Harley looks after his younger sister and protects her, much like a surrogate father figure.

Relationship With Cory Matthews

TK’s only known relationship is with Cory Matthews. Her introduction to Cory occurs when he bumps into her in the school hallways and apologizes profusely. 

TK finds his etiquette charming and begins pursuing him aggressively. Theresa showers her new love interest with home deliveries, and the pair attend a drive-in movie for their first date.

Ultimately, Cory grows uncomfortable with her grandiose overtures and fast-moving habits to the point of deciding to cool things off in their relationship. Though Harley eventually respects Cory’s reasoning, TK never reappears in the series to resolve the relationship.

Actress That Played TK on Boy Meets World

Danielle Harris is the actress who portrayed Theresa, “TK” Keiner, in Boy Meets World. Her other notable credits include multiple films within the Micheal Myers Halloween series, Free Willy, Rosanne, Charmed, and The West Wing.

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