During the 1970-1971 television series, Four-In-One (1970), rotated four separate shows: Rod Serling's Night Gallery (1969), McCloud (1970), San Francisco International Airport (1970) and The Psychiatrist (1970). "Night Gallery" and "McCloud" were renewed for the 1971-1972 season, with "McCloud" becoming the most popular and longest running. Only six episodes of San Francisco International Airport (1970) and The Psychiatrist (1970) were ever produced.