When Serling first started collecting material for The Twilight Zone he offered an open call for scripts. Anyone could submit a script based on any science-fiction idea they had. The results of this open call were disastrous:
"I got 15,000 manuscripts in the first five days. Of those 15,000, I and members of my staff read about 140. And 137 of those 140 were wasted paper; hand-scrawled, laboriously written, therapeutic unholy grotesqueries from sick, troubled, deeply disturbed people. Of the three remaining scripts, all of clearly poetic, professional quality, none of them fitted the show."
—Rod Serling quoted in The Twilight Zone Companion