Mark Hapka (born May 29, 1982) is an American film and television actor who first gained attention for portraying the lead role of the spirit 'Zach' on the Ghost Whisperer spin-off Ghost Whisperer: The Other Side. Hapka is most notable for his previous role as Nathan Horton on the NBC soap opera Days of our Lives.
Hapka had his first credited role in James Franco's 2007 feature film Good Time Max, but is best known for his starring role as the spirit 'Zach' in 2007 and 2008 in the television series Ghost Whisperer: The Other Side and Ghost Whisperer. He won the role when producers Kim Moses and Ian Sander chose him as a 'fresh face' with an 'It Guy' quality. Following this, he appeared in the television series Greek and had a minor role on Days of Our Lives as an older Johnny DiMera. In 2009, he appeared in the films Second Sightand Midgets Vs. Mascots. Also in 2009, he had a recurring role in the television series Hannah Montana and also appeared on Cold Case. In June 2009, Hapka returned to Days of Our Lives when he was cast in the contract role of Nathan Horton. Soap Opera Digest reported on January 7, 2011 that he was let go from the show. Hapka has starring roles in the upcoming films The Danny McKay Project, where he portrays the title character Danny McKay, and Beyond the Mat.