Alyson Hannigan played Trina Echolls in three episodes of Veronica Mars. She is also well known for portraying Willow Rosenberg in Buffy the Vampire Slayer and Lily Aldrin in How I Met You Mother.
Trivia[]
- Alyson and Charisma Carpenter, who played Kendall Casablancas, worked together for three years on the cult television series Buffy the Vampire Slayer, and for a couple of episodes in it's spin-off Angel.
- She met her husband Alexis Denisof also an actor in the series, when she was working on BTVS.