"Tyrannosaurus rex" has played a major role in many films, starting in 1918 with "The Ghost of Slumber Mountain", written and directed by stop motion special effects pioneer Willis O'Brien. "The Ghost of Slumber Mountain" is also, and most likely, the first film showing "Tyrannosaurus" facing "Triceratops". The king of the tyrant lizards came back in 1925 with the classic adaptation of Arthur Conan Doyle's novel "The Lost World". "Tyrannosaurus" fossils were not so famous at the time of the publication of the novel (1912), and the only main villain dinosaur in the book was "Allosaurus", with no appearance of "Tyrannosaurus", but this 1925 film featured "Tyrannosaurus" anyway, for a more dramatic and spectacular effect.