Mario Lopez, Jr. is an American television host and actor who has appeared on several television series, in films, and on Broadway. He is best known for his portrayal of A.C. Slater on Saved By The Bell, who he also portrayed as a regular on Saved by the Bell: The College Years. He has appeared in numerous projects since, including the third season of Dancing with the Stars and as host for the syndicated entertainment news magazine show Extra. He has also hosted America's Best Dance Crew for MTV, and as of 2012, he hosts the reality show of the U.S. version of the singing competition The X Factor, previously with Khloe Kardashian until 2013. Mario was brought back to host a 2nd season of the show slated to debut September 2013.