Bill Siegel's documentary "The Trials of Muhammad Ali," currently in theaters, covers the legendary boxer's Supreme Court battle over his refusal to be conscripted to fight in the Vietnam War. HBO will be offering a scripted take on the same subject when it premieres "Muhammad Ali's Greatest Fight" on Saturday, October 5th at 8pm.

Directed by Stephen Frears and written by Shawn Slovo, the film stars Christopher Plummer, Frank Langella, Danny Glover, Ed Begley Jr. and others as the legal figures involved in the case, though Ali appears only on archival footage. The film premiered as a special screening at Cannes earlier this year.