Geo-Force (Prince Brion Markov) is a fictional superhero character appearing in comic books published by DC Comics. Markov is the younger Prince Twin of Markovia and the elder brother of Terra. One of the founding members of the superhero group the Outsiders, he first appeared in a special insert in The Brave and the Bold #200 (July 1983). The character was created by Mike W. Barr and Jim Aparo.