Alexis Denisof is an American actor who is primarily known for playing Wesley Wyndam-Pryce in the television series Buffy the Vampire Slayer and its spin-off Angel. He is also best known as Mirror Master in Justice League Unlimited, Sandy Rivers in How I Met Your Mother, The Other in The Avengers and Guardians of the Galaxy, and Adam Masters in Chilling Adventures of Sabrina. Denisof is married to his Co-Star in the Buffy The Vampire Slayer Alyson Hannigan whom they have 2 Daughters. Both Denisof and Hannigan worked together in How I Met Your Mother.