1992 film by Wong Jing, Gordon Chan

A group of covert CIA operatives trailing a potential new energy source are double-crossed by corrupt agent Morgan, who causes a helicopter crash in remote South Africa. The sole survivor, suffering severe amnesia, is nursed to recovery by a kindly native tribe who call him "Whoami" after the question he keeps asking. With the help of a mysterious reporter Christine, Whoami pieces together his past and tracks the turncoat agent and his criminal cohorts.

Construction worker Douglas Quaid's obsession with the planet Mars leads him to visit Recall, a company that manufactures memories. When his memory implant goes wrong, Doug can no longer be sure what is and isn't reality.