A decade after William Shatner starred in the Twilight Zone episode “The Nightmare at 20,000 Feet,” he took a lead role in this TV horror movie with a similar name. Did it outdo his original fight against otherworldly forces on an airplane? No. But did it give actresses like Tammy Grimes and Paul Winfield a chance to play bigger than they would have in a cinematic outing? Oh my goodness, yes. Critic Alonso Duralde joins Sam to revel in this exercise in cost-effective terror.