'Buffy,' 'Angel' alum Alexis Denisof heads to 'Grimm' Actress Alyson Hannigan, a cast member in the motion picture romantic comedy "American Reunion," attends the premiere of the film with her husband, actor Alexis Denisof at Grauman's Chinese Theatre in the Hollywood section of Los Angeles on March 19, 2012. LOS ANGELES, Aug. 23 (UPI) -- Alexis Denisof is to play a recurring role on "Grimm," the U.S. thriller's co-creator David Greenwalt told TVLine. Denisof and Greenwalt previously worked together on the supernatural drama "Angel." TVLine said the actor will play Viktor Albert Wilhelm George Beckendorf, the first cousin of James Frain's Renard character, on "Grimm." The show's third season is to start Oct. 25. Also known for his work on "Buffy the Vampire Slayer," Denisof is the husband of actress Alyson Hannigan.