On the mainland, Derek Zane and Robin Hood hear about a talking female human held by Doctor Cassius. They rescue her and she kills Cassius. Notes Doctor Cassius is exclusive to the continuity of the Planet of the Apes comic books published by Marvel Comics. Doctor Cassius is exclusive to the continuity of the Marvel Comics Planet of the Apes mythos. Appearances Planet of the Apes Magazine: Beast on the Planet of the Apes Retrieved from "https://planetoftheapes.fandom.com/wiki/Cassius?oldid=37037" Categories: Marvel Characters Apes Male Characters Deceased Characters Characters Comic Characters Deceased Apes Community content is available under CC-BY-SA unless otherwise noted.