Her first leading part was in the 1992 miniseries Swans Crossing, for which she was nominated for two Young Artist Awards.
Gellar's television breakthrough came in 1993, when she originated the role of Kendall Hart on the ABC daytime soap opera All My Children, winning the 1995 Daytime Emmy Award for Outstanding Younger Actress in a Drama Series.
She’s a kickass warrior for gender equality, on top of being a wonderful person and a totally talented actress. (aka Daphne and Fred) which has made us say “D’AWWW” once again.
Gellar then appeared as Daphne Blake in the live action–comedy Scooby-Doo, directed by Raja Gosnell and co-starring Freddie Prinze, Jr., Linda Cardellini and Matthew Lillard. reuniting after a two-year disbandment to investigate a popular horror resort in a remote island.
Scooby-Doo was released on June 14, 2002 in the US, receiving generally negative reviews, During her growing film career, Gellar continued work on the television series Buffy the Vampire Slayer, but she left the show after the seventh season.
Her later film credits include The Air I Breathe (2008), Possession (2009) and Veronika Decides to Die (2009).
She headlined the short lived television series Ringer (2011–2012) and The Crazy Ones (2013–2014), which co-starred Robin Williams.
In 1991, she was cast as a young Jacqueline Bouvier in A Woman Named Jackie, starring Roma Downey.
The miniseries won the Emmy Award for Outstanding Limited Series.It was tough because, when you’re a little kid, Mc Donald’s is where all your friends have their birthday parties, so I missed out on a lot of apple pies." and also guest starred in various television series, such as Spenser: For Hire and Crossbow.At the age of nine, she appeared alongside Matthew Broderick and Eric Stoltz in the Broadway production The Widow Claire.In 2004, Gellar reprised her role as Daphne in the sequel Scooby-Doo 2: Monsters Unleashed and portrayed Karen Davis in the horror remake The Grudge, both of which grossed more than US0 million worldwide.She subsequently appeared in smaller scale movies such as The Return (2006) and Southland Tales (2007), and provided her voice for TMNT (2007).In 2015, she joined the cast of the animated series Star Wars Rebels for season two.