Final showdown for Katniss in Hunger Games finale

One of the biggest franchises in Hollywood history set to reach epic finale for leading lady.

The fourth and final film in the blockbuster Hunger Games series - a dystopian fantasy saga that turned Jennifer Lawrence into a mega-star - hits the big screen this week and is expected to catch fire at the box office.

The Hunger Games: Mockingjay - Part 2 will bring to a close one of the biggest franchises in Hollywood, which has already grossed more than US$2.2 billion ($3.4 billion) worldwide, according to Lionsgate, the studio that produced the films.

The films, based on a best-selling trilogy of young adult novels by Suzanne Collins, tells the story of Katniss Everdeen (Lawrence), the teenage heroine pitched into a deadly battle for survival in the macabre post-apocalyptic kingdom of Panem.

Lawrence - who at 25 is already an Oscar winner and the world's highest paid actress - recently told reporters in Los Angeles that she found it "bizarre" to be bidding farewell to the character that catapulted her to fame.

"I think it will be pretty bizarre when the movie is finally out and ... everything is officially done," said Lawrence, who took home a best actress Academy Award in 2013 for her performance in Silver Linings Playbook.

"This movie has been my life for so many years."

Mockingjay - Part 2 opens in several countries in Europe, Latin America, Asia and the Middle East today, and in New Zealand tomorrow.

After battling twice for her life in the Hunger Games, a reality TV-style fight to the death, Katniss is now leading rebel forces in a fight to destroy Panem's totalitarian ruler President Snow.

Jeff Bock, of the box office tracker Exhibitor Relations, said he expects the movie to rake in US$800 million worldwide - a massive figure but less than the US$865 million earned by Catching Fire, the second and most successful film in the series so far.