When it aired on the night of Dec. 3, 1968, the special became the most-watched television event of the year. Nearly half of the entire TV-watching audience tuned in to see Elvis Presley, clad in an iconic black leather suit, deliver some of the greatest performances of his life, reinvigorating his career and changing the pop-culture landscape forever. The outtakes are revealing too, none more so than previously banished footage of the backing dancer Susan Henning canoodling openly with Elvis in scenes that are disarmingly intimate.