Dr. Derek Stiles is the main protagonist of Trauma Center: Under the Knife and its sequel Trauma Center: Under the Knife 2. Gifted with the powers of the Healing Touch, he is a genius but rather bumbling surgeon that works on the forefront against GUILT. He started working in Hope Hospital under the supervision of Dr. Hoffman. After saving a victim from a strain of GUILT, he eventually transferred to Caduceus.