Assassins, murderers and bullets. Everything you can come across in a regular high-speed train ride unites in the action movie "Bullet Train" starring Brad Pitt.

The film sees Pitt's hitman character, Ladybug, seemingly taking on his easiest job as he is asked to locate a suitcase on a high-speed train and then disembark.

Unbeknownst to him, he is not the only assassin looking for the case, or for revenge. The other assassins traveling with intent include Lemon (Brian Tyree Henry), Tangerine (Aaron Taylor Johnson), Prince (Joey King), Hornet (Zazie Beetz) and Wolf (Bad Bunny).

Pitt said he read the script while under lockdown during the COVID-19 pandemic and found himself laughing.

"It's just like the salve for what we needed," Pitt said at the movie's red-carpet premiere in Hollywood. "Now it's summer, we can be out and release it, and it just feels fun."

The movie, directed by "Deadpool 2" filmmaker David Leitch, was filmed while pandemic lockdowns and extensive COVID-19 prevention protocols were still in place. "We had the outer circle and people could only be on the train from the inner circle," Pitt said in an interview. "We had to get off the train for the outer circle to come on. It was just like a bit of a Keystone Cop situation."

The film sees Pitt's character go toe-to-toe with the other assassins in high-octane and often humorous fight scenes.

Henry, who speaks with a Cockney accent in the film, said the fight sequences with Pitt were "the most therapeutic thing that ever happened."

"I think that the consensus is everyone left a little bit better after slapping the s--- out of Brad, so it was a lot of fun," Henry said.