Giganotosaurus ("giant southern lizard") is currently one of the largest known meat-eating dinosaur ever. For many years Tyrannosaurus held that record (although bits and pieces of Carcharodontosaurus and Spinosaurus showed that they were as large as any individual T. rex). Then, 1989 a lower jaw bone and several teeth were discovered in Patagonia. Not enough to classify the remains as a new genus, a second specimen was discovered in 1993 with far more complete remains. The second specimen, the new holotype, was discovered to be of near equal size to the largest Tyrannosaurus. And then the study went back to the 1980s specimen, discovering it to be substantially larger. In 1995, paleontologists Rodolfo Coria and Leonardo Salgado reported the discovery of a new meat-eater bigger than any tyrant lizard. Potentially the largest predatory dinosaur ever found, they named the goliath dinosaur, Giganotosaurus carolini. Carolini's Giant Southern Reptile.
Bone for bone, it was larger than the largest skeleton of T. rex ever found! The skull alone was 6 feet (1.8 m) long! Clearly, Giganotosaurus was a gigantic dinosaur and certainly the largest Carnosaur.
When Giganotosaurus was alive, the most common plant-eaters in South America were the titanosaur sauropods. While a single Giganotosaurus could kill a young titanosaur, it would take many Giganotosauruses to bring down a giant adult. Originally, there was no evidence that Giganotosaurus hunted in groups, but a recent discovery from slightly younger rocks of a close relative called Mapusaurus shows that they indeed may have lived in packs of 6-12 or more individuals.
Genetic material of Gigantosaurus was in possession of InGen by the year 2014 and was used in the creation of the genetic hybrid Indominus rex. It's genetics were used to bolster the hybrid's size.
If any Gigantosaurus were cloned on Isla Nublar they might have lived in the park after the Indominus rex breakout in 2015 Gigantosaurus they went wild on Isla Nublar.
If any Giganotosaurus survived the three years on Isla Nublar they might have been saved offscreen.