Dan portrays Paul Snider, a promoter that Steve recruits to help his business. After he begins working on building the Chippendales show with Steve, Paul murders his wife, Dorothy Stratten, before killing himself.
From 2010 to 2012, Dan appeared as Matthew Crawley in Downton Abbey. He later played characters like the Beast in the live-action iteration of Disney's Beauty and the Beast, Charles Dickens in The Man Who Invented Christmas, and David Haller in the series Legion. In addition, Dan may be recognized for starring in Eurovision Song Contest: The Story of Fire Saga, as well as the 2022 miniseries Gaslit.
In 2023, Dan can be seen in the horror film Cuckoo, and he will be leading the 2024 sequel to Godzilla vs. Kong.