The roots of this week’s summer blockbuster “Jurassic World: Rebirth” go back to 1990 when Michael Crichton’s bestselling novel “Jurassic Park” employed DNA to fantasize on genetic engineering that could recreate the gigantic dinosaurs that once roamed our planet.

Steven Spielberg’s 1993 adaptation, literally a monster hit, advanced Hollywood’s understanding of the possibilities of CGI, spawned a franchise and theme park rides.

“Rebirth,” helmed by England’s Gareth Edwards (“Rogue One: A Star Wars Story”) and starring Scarlett Johansson, Mahershala Ali and Jonathan Bailey, is the 7th film in the franchise. It bears a writing credit to Crichton, who died in 2008 at 66. It’s basically a reworking of Crichton-Spielberg tropes from the original.

In 1995 Crichton had another Number One bestseller with his sequel “The Lost World” which Spielberg again adapted in the 1997 hit.

This marked Crichton’s exit from penning any more dinosaur adventures (if not from a percentage of the profits). Spielberg also stepped out of the director’s chair to continue as a producer.

“Jurassic Park III” (2003) is notable for last-minute script changes by David Koepp, who not only scripted the previous two, he wrote this week’s “Rebirth” as well. “JPIII” was a popular if not critical hit.

After a pause, a reboot was in order as the new trilogy was dubbed “Jurassic World” with Colin Trevorrow co-writing the three films and directing the trilogy’s first and third installments.

To revive the franchise, Trevorrow needed to score — and that he did with a record-breaking $1.6 billion global gross.

“World” is set 22 years after “Jurassic Park” and takes place on the same fictional island of Isla Nublar with the theme park envisioned by John Hammond in the original now a reality.

As every “Jurassic” entry well knows, peace and harmony never last when a rogue dinosaur decides to rampage. The ensemble, led by Chris Pratt, Bryce Dallas Howard, Vincent D’Onofrio and, from the original, BD Wong are involved in a vivid, pulse-pounding illustration of Crichton’s “chaos theory.”

Is the 2018 “Jurassic World: Fallen Kingdom” the franchise’s weakest entry? The storyline certainly strays from the pleasures that launched the franchise, what with a volcanic evacuation of the island and the dinosaurs being transferred by cargo ships to a billionaire’s Northern California estate to be sold at auction on the black market.

“Jurassic World: Rebirth” is back in semi-familiar waters with favorite monsters and two groups struggling to survive, initially in the water and then amid the abandoned refuse of yesteryear.

“Jurassic World: Rebirth” opens July 2