Linda Cardellini joins the cast of NBC?s hit medical drama as nurse Samantha Taggart, a free-spirited single mother.

In addition to her role on ?ER,? Cardellini recently completed filming the sequel to the hit live-action animated feature ?Scooby-Doo,? which also starred Sarah Michelle Gellar, Freddie Prinze, Jr. and Matthew Lillard. Cardellini reprises her role as Velma Dinkley, the brains of Mystery, Inc., in ?Scooby-Doo 2: Monsters Unleashed.?

Making her mark in the critically acclaimed series ?Freaks and Geeks,? Cardellini starred as Lindsay Weir (a precocious academic decathlete who experiences a crisis of faith after witnessing the death of her grandmother). Her witty and biting portrayal of the teen still resonates among the shows cult following.

Among Cardellini's other film credits are ?Legally Blonde,? ?Good Burger,? ?Dead Man on Campus? (with Tom Everett Scott and Marc-Paul Gosselaar), the thriller ?Strangeland,? and the independent feature ?The Unsaid,? opposite Andy Garcia. She also recently completed work on another independent project, ?Welcome to LaLa Wood,? opposite Martin Short.

Cardellini?s other television work includes ?The Lot,? ?Guys Like Us? and ?Bone Chillers.? Her guest appearances include ?3rd Rock from the Sun,? ?The Twilight Zone,? ?Boy Meets World,? ?Clueless? and ?Pacific Palisades.?

A native of Mountain View, California, Cardellini always wanted to entertain and loves the art of bringing written characters to life. She currently lives in Los Angeles.