Thomas Ian Nicholas

He portrayed historic figures Frank Sinatra Jr. In Stealing Sinatra (2003) and Walt Disney in Walt Before Mickey (2015). Nicholas has also had lead roles in the films A Kid in King Arthur's Court (1995) and Adverse (2020), and supporting roles in Halloween: Resurrection (2002), The Rules of Attraction (2002), Please Give (2010), Bilal: A New Breed of Hero (2015), and Sheep and Wolves (2016). In television, Nicholas had recurring roles on Fox shows as Todd Marsh on Party of Five (2000) and Nick Hutchison on Red Band Society (2014–2015). He had a main role as Joe on the Tubi mockumentary sitcom Underdeveloped (2023), and provided a lead voice dubbing role on the American version of the Cartoon Network animated series Gormiti Nature Unleashed (2013–2014).

Nicholas was born in Las Vegas, Nevada. His mother, Marla, was a professional dancer and an acting school administrator.

Nicholas's early roles included appearances in the TV shows Who's the Boss?, Married... with Children and Dr. Quinn, Medicine Woman. He became known for his roles in the films Rookie of the Year (1993), A Kid in King Arthur's Court (1995) and American Pie (1999). He appeared in the four theatrical films of the American Pie franchise, as Kevin Myers. Nicholas had a recurring role as Todd Marsh on Party of Five (2000). He also co-starred in Halloween: Resurrection (2002), played Mitchel in the Roger Avary-directed The Rules of Attraction (2002), and played Frank Sinatra, Jr. in the Showtime movie Stealing Sinatra (2003). In 2009, he played the role of a rookie cop in the drama Life Is Hot in Cracktown. with Lara Flynn Boyle. Nicholas played Eugene in the supporting cast of Nicole Holofcener's film Please Give (2010), which won the 2010 Independent Spirit Robert Altman Award, given to the ensemble cast. He had the role of Abbie Hoffman in the film The Chicago 8 (2011). He also appeared on an episode of ABC's Grey's Anatomy as Jeremiah. In 2015, Nicholas appeared in Walt Before Mickey, where he portrays a young Walt Disney during the struggles of his early life and career. He also played Nick Hutchison in Steven Spielberg's TV drama series Red Band Society (2014–2015), and had roles in Bilal: A New Breed of Hero (2015), and Sheep and Wolves (2016). Nicholas is the lead actor in the Lionsgate film Adverse, opposite Mickey Rourke, Sean Astin, Lou Diamond Phillips and Penelope Ann Miller. The film was released in February 2021.

Nicholas self-released his debut album, Without Warning, on January 15, 2008, and his follow-up album, "Without Warning Acoustic" on February 28, 2009. His third release was Heroes Are Human, put out on June 1, 2010. His fourth release is a self-titled EP, released March 20, 2012; the first single "My Generation" also appears as part of the American Reunion soundtrack album. His fifth release is the EP Security released on April 8, 2014. In March 2015, Nicholas appeared on Blues Traveler's album Blow Up the Moon, co-writing the song "All the Way." On July 9, 2022, Nicholas released "1999", a single that parodied the SR-71 (band) song "1985".

Nicholas married Colette Marino, known as DJ Colette, in 2007. The couple had their first child, a son, in 2011. Their second child, a daughter, was born in April 2016. In May 2022, Colette filed for divorce from Nicholas.