Chris Pratt
Chris Pratt as dinosaur trainer Owen in Jurassic World Legendary Pictures

As filming for Colin Trevorrow's Jurassic World began, speculation regarding the movie plot has surfaced on the web. According to latest rumours, Chris Pratt will battle a new breed of the T-Rex in the fourth instalment of the Jurassic Park franchise.

Recently, it was revealed that the new "bad" dinosaur will be a mutant breed, the unpredictable 'Diabolus Rex' or D-Rex, which will trigger a crisis in the upcoming movie.

According to Movie Pilot, Diabolous Rex, created by fusing DNA of various species, will be a hybrid of a snake, cuttlefish, T-Rex and Velociraptor. Trevorrow confirmed that D- Rex will be a new dinosaur, but also clarified that it would not be a "mutant freak."

"We were hoping audiences could discover this on their own, but yes, there will be one new dinosaur created by the park's geneticists. The gaps in her sequence were filled with DNA from other species, much like the genome in the first film was completed with frog DNA," he said.

"This creation exists to fulfil a corporate mandate - they want something bigger, louder, with more teeth. And that's what they get."

According to the plot, crowds are thinning out at Jurassic Park as dinosaurs have existed for some time. The new star attraction to tempt them back will be the D-Rex.

Jurassic World
Jurassic World Poster Universal

Trevorrow spoke about Pratt's character in an interview, and revealed that Pratt's character, Owen, will be responsible for doing behavioural research on the dinosaurs.

"Chris Pratt's character is doing behavioural research on the raptors. They aren't trained, they can't do tricks," he said.

"He's just trying to figure out the limits of the relationship between these highly intelligent creatures and human beings. If people don't think there's potential in those ideas, maybe they won't like this movie. But I ask them to give it a chance."

Jurassic World, which will be set 22 years after the original Jurassic Park, is located on the same island as the first film, the fictional Dinosaur Theme Park island of Isla Nublar.

The film will hit cinemas on 12 June, 2015.