Satanus is a gigantic T-Rex and a villain in the 2000 AD comic strip Judge Dredd. Although he has also been in the strips Nemesis the Warlock, Sinister Dexter and Flesh.
He was a massive Tyrannosaurus Rex originally from the Cretaceous era, however he is killed in a fight with his mother Old One Eye. The T Rex is bought back to life by a scientist and was used as a circus attraction before escaping and becoming the leader of a whole herd of Tyrannosaurs in the Cursed Earth.
He eventually crossed path with Judge Dredd and with help from Spikes Harvey Rotten the Tyrannosaur is nearly killed, it clashed with the law man on several later occasions before being sent back to its original time by Toth the son of Nemesis the Warlock.