Rebecca De Mornay was originally cast to play the role of Mona. After DeMornay pulled out, Cynthia Rothrock was offered the role only one day prior to filming.
Released on August 5th, 2014 to capitalize on I mercenari 3 (2014), which was released in the U.S. on August 15th, 2014.
There is a connection between four of the lead actresses in the film: Brigitte Nielsen starred opposite Arnold Schwarzenegger in Red Sonja (1985). Kristanna Loken starred opposite Arnold Schwarzenegger in Terminator 3: Rise of the Machines (2003). Vivica A. Fox had a cameo in Batman and Robin (1997) which she shared a scene with Arnold Schwarzenegger and Zoe Bell was Uma Thurman's stunt double in Kill Bill: Vol. 1 (2003) which also starred Vivica A. Fox. Uma Thurman also starred in Batman and Robin (1997).