Film Network. In 1959, McCaw became the sole owner of channel 2, buying out Shaheen's share in the station. In 1963, McCaw changed the call letters to KCTO (for "Channel TwO"). Under Tribune ownership In September 1965, the station was acquired by Tribune Broadcasting – then known as WGN Continental Broadcasting. After the sale was finalized in March 1966, the new owners changed the call letters to KWGN-TV after its new sister station and the company's flagship, WGN-TV in Chicago (the WGN calls refer to the longtime slogan of the company's former flagship newspaper, the Chicago Tribune, "World's Greatest Newspaper"; the newspaper division was split into a separate company in August 2014). At the time of its purchase, KWGN became Tribune's fourth television station property—after WGN-TV, WPIX in New York City, and KDAL-TV (now KDLH) in Duluth, Minnesota, the latter of which was owned by Tribune from 1960 to 1978. When WGN Continental Broadcasting bought channel 2, it gave the station a significant technical overhaul, allowing it to broadcast programming in color. KWGN promoted itself as Colorado's only all-color station, because all of its local programs were produced in the format. Denver's three major network affiliates—KOA-TV (channel 4, now KCNC-TV), KLZ-TV (channel 7, now KMGH-TV) and KBTV—were broadcasting national network programs in color, but had yet to equip their studios with color cameras for local programming production. As an independent station, KWGN aired a mix of off-network sitcoms and dramas, cartoons, movies, syndicated game shows and locally produced programs such as Blinky's Fun Club, Denver Now, Afternoon at the Movies with Tom Shannon and public affairs program Your Right to Say It. It took six years for WGN Continental to make the station profitable. Beginning in the 1960s, the station started building a massive network of translators across the state. Around this time, KWGN became a regional superstation (long before that term was coined and popularized by Atlanta station WTBS). At its height, it was available on nearly every cable system in Colorado and Wyoming, as well as portions of Idaho, Kansas, Montana, Nebraska, New Mexico, South Dakota, Utah and Washington. KWGN was attractive to cable systems because its programming had no duplication with programs seen on the local network affiliates within their given markets. Additionally, it was the only independent station that was available in much of the region until the 1980s. It remained the only independent station in