When Michelle Trachtenberg suddenly appeared among the already-familiar cast members of Joss Whedon’s much-loved turn-of-the-21st-century TV show Buffy the Vampire Slayer, at the beginning of the fifth season,

Michelle Trachtenberg's credits include performances in 'Harriet The Spy,' 'Mysterious Skin' & 'Buffy The Vampire Slayer'

To honor the late Michelle Trachtenberg, Entertainment Weekly looks back on her most iconic movies and TV shows, from 'Harriet the Spy' to 'Gossip Girl.'

Actress Michelle Trachtenberg has died at the age of 39. Trachtenberg starred in multiple hit TV series, such as “Gossip Girl” and “Buffy the Vampire Slayer.” These are some of Trachtenberg’s more iconic roles.

Michelle Trachtenberg's first credited role was on Nickelodeon's 'The Adventures of Pete & Pete,' and it's the role that our TV critic will remember her most by.

Georgina Sparks was not Gossip Girl, but she might as well have been. The character, a socialite who trafficked in wild manipulation, convoluted scheming and plenty of narcotics, was a main antagonist of the 2000s teen drama series that aired on the CW network,