I Know What You Did Last Summer Wiki

Lennon Grant is one of the main characters in the Prime Video original series, I Know What You Did Last Summer. She is portrayed by Madison Iseman.


Throughout the Series[]

Season 1[]

Lennon was born on December 20th, 2004. Lennon has been best friends with Margot since kindergarten. She and her twin sister, Allison, however, are not as close. They fight even though it seems like deep down Lennon wants Allison to live a better life.

In the first episode of the series, Lennon gets hit by a car that Allison is driving. She dies and her friends hide her body in a cave. Allison takes over Lennon's identity and pretends to be her. She was out in the road because a little bit before she got into a argument with her dad and left his car.


Lennon has a big personality. She is a party girl, loves to flirt, do drugs, and hang out with her friends.

Physical Appearance[]

Lennon has short blonde hair and wears modern, trendy clothes. Her hair is wavy. She wears a lot of makeup. Lennon is short and petite.

Notes and Trivia[]

  • Lennon had sex with Dylan, though she knew that Allison liked him.