Bosses behind Sylvestor Stallone's action movie The Expendables 2 are facing legal action from a stuntman over injuries he allegedly sustained during an accident on set.

Nuo Sun filed documents at Los Angeles Superior Court on Thursday against Millennium Films chiefs and other entities involved with the production, according to TheWrap.com.

Sun claims he was injured in an explosion while filming a stunt on a rubber boat near the Ognyanovo Reservoir/Dam in Bulgaria in October, 2011.

The papers allege the accident left Sun with "severe shock and injury to and upon his nervous system, neck, head, body, arms and injuries, all of which may be permanent," as well as "great mental, physical and nervous pain and suffering."

Sun is seeking general damages in excess of $25,000, plus medical expenses past, present and future, compensation for loss of earnings and income, plus the costs of the suit.

The explosion killed another stuntman, 26-year-old Kun Liu. His parents sued The Expendables 2 filmmakers for more than $25 million in July.