Daniel Riordan is an American actor best known for his work across Star Trek series, where he's made multiple appearances. Beyond the franchise, he's popped up in cult films like Ed Wood and Jingle All the Way. Fans probably recognize his voice work more than anything—he voiced the Dark Specter in Scooby-Doo: The Mystery Begins (alongside Garry Chalk and Frank Welker), Mr. Sinister in X-Men Legends II: Rise of Apocalypse, and Doc Samson in The Incredible Hulk: Ultimate Destruction. He's also known for voicing Alduin the World-Eater in The Elder Scrolls V: Skyrim, which has given him a notable presence in gaming circles.