Guintoli is a rare reality TV star who's been able to transition into dramatic acting. He got his start on MTV's 'Road Rules: South Pacific' and also appeared on 'Real World/Road Rules Challenge: The Gauntlet.' In 2007, he took up acting, and has since appeared on 'Nip/Tuck,' 'Veronica Mars' and 'Grey's Anatomy,' to name a few. In his first leading man role on NBC's new procedural fantasy, he plays Nick Burkhardt, a homicide detective with a strange family secret.

'Grimm' premieres Fri., Oct. 21, 9PM ET on NBC