When Three's Company debuted in March 1977, it was up against the second half-hour of Hawaii Five-O on CBS and the second half-hour of NBC's Best Sellers, a two-hour NBC series featuring serialized installments of four novels: Captains & The Kings, Once An Eagle, Seventh Avenue and The Rhinemann Exchange. In April 1977, the Best Sellers series moved to Monday nights and was replaced on Thursdays with Thursday Night At The Movies. In September 1977, CBS debuted Man From Atlantis (9-10 PM Thursdays) and Rosetti & Ryan (10-11 PM Thursdays).