8. Giganotosaurus
For many, the T-Rex was the hero of the original Jurassic Park. The scene that introduces her through the ripples in the cup of water very quickly entered the pop cultural lexicon and when she did appear she looked amazing. The effects, both animatronic and CGI did not disappoint. Spielberg, too, clearly realised the T-Rex was the star by having her come and save the day at the end. In the third movie, though, a need to up the ante saw director Joe Johnston introduce a rival huge carnivore as the new movie's new star. The dinosaur chosen, Spinosaurus, may have been an even larger beast than the Tyrannosaur, but the fish eating creature never seemed the same kind of physical threat. Possibly this is just due to its shape, that long, thin mouth and teeth not quite a match for T-Rex's huge head and massive razor teeth. Giganotosaurus (often mistakenly spelled "Gigantosaurus") offers a creature that is similar to a Tyrannosaur, a fellow Carcharodontosaurid dinosaur, but one that, at comfortably over 40 feet in length, may have been even bigger than Jurassic Park's biggest carnivore. A Tyrannosaur vs. Giganotosaur battle would be fun to watch, but it's possible that both dinosaurs look a little too similar for people to tell them apart. Not properly discovered until 1993, the year the first movie came out, Giganatosaurus would be a good way to reference animals that were unknown at that time, albeit one that doesn't quite fit with the idea that these were first cloned in the early 90s.