a healer, tutor, and skilled mechanic. He is the journeyman of 2, the great engineer and inventor. He is a diligent worker, a meek spirit, and a devoted friend. He is missing his left eye (lost years earlier in a Walker attack), instead wearing a metal plate. The Scientist remarked that 5 was the first of his creations not to run off or explore the workshop; instead, 5 was very trusting of the Scientist. He has buttons on his front to fasten his skin. Voiced by John C. Reilly.