"What You Need" starts out intriguingly, but this story of a supernatural peddler is a little too much like "Mr. Denton on Doomsday," and the finale feels rushed, like it was thrown out there solely to produce a "gotcha!" moment.
The idea is a good one, but we never really know why Renard is so quick to exploit the gift of Mr. Pedott. It's also unclear as to why Pedott waits so long, after giving Renard "what he needs" for most of the episode, to cut him off.
Ernest Truex is very good in the part of Pedott and does his best to sell the conclusion, even if it is lackluster. And there are some nice spooky scenes, such as Renard's scarf getting caught in the elevator. But with its finale spelled out to the viewer in clumsy exposition, "What You Need" doesn't wind up among the cream of the crop in "The Twilight Zone."