Dr. Uroff-Koltoff (played by Alex Diakun) is a doctor who worked for Franz Tomczeszyn at his house at 2502 Bellflower Road. He made illegal attempts to transplant Tomczeszyn's head to a new body. However he failed when Scully and the Other Agents interfered with the operation, later once arrested the newspaper declared him a modern-day Frankenstein. He is the main antagonist of the film. (The X-Files: I Want to Believe)

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