Theodore Peter James Kinnaird Taptiklis (born 16 December 1984) is an English actor. He is known for portraying Tobias "Four" Eaton in The Divergent Series film trilogy. James starred in the horror films Underworld: Awakening (2012) and Underworld: Blood Wars (2016), the action film How It Ends (2018), and the science fiction film Archive (2020). In television, he appeared in the crime drama series Golden Boy (2012) and the romance series The Time Traveler's Wife (2022).