His debut as the character Walden Schmidt, entitled "Nice to Meet You, Walden Schmidt", was seen by 28.7 million people on September 19, 2011.
The Nielsen ratings company reported that figure was more than any episode in the show's first eight seasons, when Sheen starred in it.
The film received mixed to negative reviews, but was a box office success.
In 2003, Kutcher produced and starred as the host in his own series, MTV's Punk'd, that involved hidden camera tricks performed on celebrities.
Kutcher subsequently appeared in more romantic comedies, including Guess Who (2005), A Lot Like Love (2005), What Happens in Vegas (2008), and No Strings Attached (2011).
From 2011 to 2015, he starred as Walden Schmidt on the CBS sitcom Two and a Half Men.
He is also an executive producer of the reality television shows Beauty and the Geek, Adventures in Hollyhood (based around the rap group Three 6 Mafia), The Real Wedding Crashers, and the game show Opportunity Knocks.
Many of his production credits, including Punk'd, come through Katalyst Films, a production company he runs with partner Jason Goldberg.
I was partying, and I woke up many mornings not knowing what I had done the night before. I am amazed I am not dead." and was recruited to enter the "Fresh Faces of Iowa" modeling competition.
They were married in September 2005 and separated in November 2011.