The stars of Terminator: Genisys might be battling guns and indomitable machines on screen, but off screen the ice bucket challenge can be a real threat. Most of the main cast members and some of the crew braved the chill for a good cause.

Terminator: Genisys To "Remind Fans Why They Fell In Love" With The Original  

The stars who took the challenge at the behest of David Ellison the producer of Genisys include Emilia Clarke, who plays Sarah Connor in the movie, Jai Courtney, who stars as Kyle Reese, Matt Smith, who might be playing a younger John Connor. Ellison nominated the three from the Terminator team for the freeze off. All three actors honored Ellison's request.

The filming for Terminator wrapped on August 6. Arnold Schwarzenegger, who is reprising his role as the iconic cyborg in the movie revealed they were done filming, with a thank you note to the director, producers and crew of the movie.

Terminator: Genysis To Focus On The Origins Of Sarah Connor? 

"Hasta la vista, baby. I want to thank the cast and crew of @TerminatorGenisys for a fantastic shoot. It was challenging, it was fun, and it was rewarding. From our director to the producers, from the camera team to catering, from visual effects to hair and makeup - we couldn't have done it without you. I can't wait to see our finished project and I know we'll remind the fans why they fell in love with the Terminator. On July 1, 2015, I'll be back," he tweeted.

The movie is being directed by Alan Taylor and is scheduled for release in July 2015.

Watch Emilia Clarke take the challenge:

Watch Jai Courtney take the challenge:

Watch Matt Smith take the clip:

Watch David Ellison take the challenge:

Tags: Terminator: Genisys Movies