Gregg Shank (born July 27, 1953) is a former American child actor who made a memorable, if brief, impact on the science fiction genre during the early 1960s. Born Gregory Gaylord Shank in Orange County, California, he was part of a generation of young performers who provided the essential emotional stakes for the high-concept genre films of the era.
Shank is best known for his role as Rocky Fielding in the 1963 cult classic The Day Mars Invaded Earth. As the youngest member of the Fielding family, he played the son of a high-ranking rocket scientist whose lives are systematically upended by emotionless Martian doppelgängers. His performance was central to the film’s unique approach to “suburban horror,” where the threat wasn’t a giant monster, but the silent and terrifying replacement of one’s own family members.
The production of the film was a true family affair for the young actor; he appeared alongside his real-life father, William Shank, who played the estate caretaker. This personal connection added to the naturalistic feel of the family dynamics on screen. Working alongside established stars like Kent Taylor and Marie Windsor, Gregg Shank helped create the unsettling atmosphere that has made the film a standout of the 20th Century Fox “B-unit” productions, particularly noted for its infamously dark and uncompromising finale.
Though he did not pursue a long-term career in front of the camera, his role as the innocent Rocky remains a point of fascination for science fiction historians and collectors of 1960s “drive-in” cinema. His contribution to the film helped anchor its fantastical premise in a relatable reality, ensuring that the Fielding family’s eerie fate continues to resonate with audiences decades later.
