When Martian Manhunter was first introduced in the 1950s, his human disguise was that of John Jones, a white detective. However, in several excellent depictions since then, he has been portrayed by black actors, including Carl Lumbly, David Harewood, and Harry Lennix. What was the first instance, in either animation or live-action, where Martian Manhunter was portrayed by a black actor? Is there any information in regards to why this became a trend when casting the character in other media?