Maxtible and Waterfield experimented with time travel, accidentally bringing them in contact with the Daleks in 1866. He willingly served the Daleks, who promised him the secret of turning metal into gold. Unlike Waterfield, Maxtible felt no guilt at the deaths caused by the Daleks.
During the destruction of the Dalek City, he killed Kemel by pushing him off a cliff. He was presumably killed in the destruction of the city caused when war broke out between the loyalist Daleks, and those affected by the Human Factor. (TV: The Evil of the Daleks)