network had already received 29,000 fan letters for the show during its first season, more than for any other except The Monkees. When rumors spread in late 1967 that Star Trek was at risk of cancellation, Roddenberry secretly began and funded an effort by Bjo Trimble, her husband John, and other fans to persuade tens of thousands of viewers to write letters of support to save the program. Using the 4,000 names on a mailing list for a science-fiction convention, the Trimbles asked fans to write to NBC and ask 10 others to also do so. NBC received almost 116,000 letters for the show between December 1967 and March 1968, including more than 52,000 in February alone; according to an NBC executive, the network received more than one million pieces of mail but only disclosed the 116,000 figure. Newspaper columnists encouraged readers to write letters to help save what one called "the best science-fiction show on the air". More than 200 Caltech students marched to NBC's Burbank, California studio to support Star Trek in January 1968, carrying signs such as "Draft Spock" and "Vulcan Power". Berkeley and MIT students organized similar protests in San Francisco and New York City. The letters supporting Star Trek, whose authors included New York State Governor Nelson Rockefeller, were different in both quantity and quality from most mail that television networks receive: In addition: NBC—which used such anecdotes in much of its publicity for the show—made the unusual decision to announce on television, after the episode "The Omega Glory" on March 1, 1968, that the series had been renewed. The announcement implied a request to stop writing—NBC's policy of replying to each viewer mail meant that the campaign cost the network millions of dollars—but instead caused fans to send letters of thanks in similar numbers. Season 3 (1968–1969) NBC at first planned to move Star Trek to Mondays for the show's third season, likely in hopes of increasing its audience after the enormous letter campaign that surprised the network. In March 1968, though, NBC instead moved the show to 10:00 pm Friday night, an hour undesirable for its younger audience, so as not to conflict with the highly successful Rowan & Martin's Laugh-In on Monday evenings, from whose time slot Laugh-In producer George Schlatter had angrily demanded it not be rescheduled. In addition to the undesirable time slot, Star Trek was now being seen on