Watch on 123Movies. Nelson Mandela and his fellow ex-prisoners recall their incarceration on South Africa's Robben Island. For three decades, the island housed not only political prisoners but convicts, lepers and the mentally ill. Yet amidst the hopelessness, Nelson Mandela and his comrades devised strategies and subterfuges with which they transformed life on the island, while the vision of a new South Africa began to take shape.