Tim Kang

as Kimball Cho

as Mark

as Gordon Katsumoto (91 episodes)

as Dr. Ken (Room 731)

as Ivan Hess (4 episodes)

as School Superintendent

as Steve Kim (1 episode)

as Mike Serrano (1 episode)

as Private Young

as Dr. Ken

as Adam (1 episode)

as Dr. Lyle

Producer

as Tom Chang (1 episode)

as Agent Wang

as Oscar (3 episodes)

as Kimball Cho (151 episodes)

as En-Joo

as Chaplain Alan Lantz (2 episodes)

as Warren Chen (1 episode)

as Koh (1 episode)

as Liam Kelly (1 episode)

as Agent Alec Wong

as Young John

as Paul the Attorney