Marc Hannibal was an American actor and singer who appeared in a single Italian film, Alfonso Brescia’s extremely silly Superuomini, superdonne, superbotte (75).
By all acounts, Hannibal started out as a basketball player, appearing for the famed Harlem Globetrotters and becoming notorious for his trademark ’45 Foot single-handed set shot’. He was good friends with Wilt Chamberlain, another former Globetrotter who had a breif cinema career (Conan the Destroyer, 84).
He started acting in the late 1960s, appearing in several TV series (Ironside, Mission IMpossible, Columbo, McLoud). His film career, though, was brief: apart from Superuomini he only had very small roles in The Grasshopper (69), The Man from ORGY (70) and Joey (77). The last credit I have for him is in an episode of Kojack from 1978, and after that he appears to have moved out of the film industry.
I have found news reports about a Marc Hannibal who was in a car accident in late 2010, who could well be the same person!