Only Shatner could pull this off with that over the top style! There is no social commentary on Nightmare at 20 000 Feet. The episode is just pure terror. A very young William Shatner plays a paranoid character excellently. William Shatner plays a man who is recovering from a nervous breakdown, who is an airplane passenger, who sees a creature on the wing of the airplane. Of course, no one believes Shatner. Is the creature/saboteur real or is it just in Shatner's head? I will not ruin the ending. The ending is a classic and unforgettable. Shatner's over acting plays perfectly for an unbalanced person. Most of Twilight Zone episodes are forgettable but 20 000 feet stands outs. My personal favorite. I give 20 000 feet a nine out of ten. I don't think another actor could have pulled this episode off as well as William.