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In 1979, he joined the Jackie Chan Stunt Team and focused more on being a stuntman and action director rather than an actor. Being a very close friend of Chan, Mars has worked with Chan in numerous films starting with "The Young Master" (1980). He played a major supporting role in Chan's hit films, "Project A", "Project A II", "Police Story" and "Police Story 2". Mars also had minor villain roles in Chan's other hit films, "Crime Story", "Drunken Master II" and "Thunderbolt". He also acted in many of Chan's other films and was also a stuntman in his films.