for months, frontier tried to arrange for neill, goldblum and dern to record their lines together, but scheduling issues prevented this from occurring. instead, recordings of one actor would be played for the others to aid them in recording their own lines. the dlc also features the character of john hammond, who was portrayed in the films by richard attenborough (1923–2014). in the dlc, hammond was portrayed by voice actor mackenzie gray. "return to jurassic park" was in development for a while as the frontier team wanted to take its time to create a comprehensive dlc based on the first film. it is the biggest update created for "jurassic world evolution". executive producer rich newbold said, "essentially, the whole game has been rebuilt with a jurassic park version of every building". dinosaur designs based on "the lost world: jurassic park" and "jurassic park iii" were also introduced in the dlc. for reference, universal provided the developers with original assets and audio files from the film production archives to ensure that the dinosaurs move, sound, and look like their film counterparts. the package introduced "compsognathus" and "pteranodon", as well as new designs for the game's "tyrannosaurus rex" and "velociraptor", matching their original appearance in the first film.