Marcus Paul Blucas is an American actor. Prior to his acting career, he played college basketball with the Wake Forest Demon Deacons. He had his first starring role as soldier and love interest Riley Finn on the WB supernatural drama series Buffy the Vampire Slayer from 1999 to 2000, and later starred as football team manager Matthew Donnelly on the USA drama series Necessary Roughness from 2011 to 2013.

Riley Finn is a fictional character created by Joss Whedon for the television series Buffy the Vampire Slayer. Portrayed by Marc Blucas, Riley was introduced in the 1999 season four premiere episode, "The Freshman", and Blucas was part of the series credited cast for the second part of season four and the first part of season five. Most notably, Riley is one of three long-term romantic interests for series' heroine Buffy Summers.