Premise: "The Encounter" is episode 151 of the American television series "The Twilight Zone". First broadcast on May 1, 1964, its racial overtones caused it to be withheld from syndication in the U.S. On January 3, 2016, the episode was finally reaired as part of Syfy's annual "Twilight Zone" New's Year Eve marathon.
Hypothesis: There were 150 episodes before The Encounter.