During volume three of WatchmeX in an effort to cure her cancer, Bubastis seeks out Dr. Manhattan but due to his ongoing heroin addiction his powers are too unstable. As a result, several tumor cells are removed and become sentient, rapidly growing into a parody of Bubastis.
Calling herself Sitsabub she finds she has amazing powers due to the circumstances of her "birth". She reveals her existence to a horrified Bubastis and mockingly calls her "sister" before leaving for parts unknown.
Sitsabub returns in issue #16 of volume three as the leader of a strange cult of Ozymandias worshipers in Egypt. She kills her sister by totally removing her intrinsic field, telling her "this is the way it has to be, the circle must be finished!"