He also appeared in a series of ancient history and mythological epics: as Gannicus in the 2004 TV movie Spartacus' Hephaestion in the 2007 movie Young Alexander the Great, and the title role in the 2005 TV miniseries Hercules.
In 2007, Telfer appeared in five episodes of the second series of the BBC drama Hotel Babylon (as Luke), and also in the TV series NCIS, (as Marine Corporal Damon Werth). The episode, "Corporal Punishment", was broadcast on CBS in the United States. He also appeared in 2 episodes in season 7, "Outlaws and In-laws" and "Jack Knife" as Damon Werth.
He appeared in the 2011 movie Son of Morning.
In 2012, he appeared in The Vampire Diaries, episode four, titled The Five, as Alexander.