WB, CBS Corporation and the Warner Bros. Entertainment division of Time Warner, announced that they would dissolve the two networks to create The CW Television Network, a joint venture between the two media companies that initially featured programs from its two predecessor networks as well as new series specifically produced for The CW. On that date, The CW also signed a ten-year affiliation agreement with Tribune Broadcasting, under which sixteen of the group's eighteen WB-affiliated stations would serve as the network's charter stations. One of the stations included in the agreement was KPLR-TV, which was announced as the network's St. Louis affiliate over WRBU; although, since the network chose its affiliates based on which television station among The WB and UPN's respective affiliate bodies was the highest-rated in each market, it is likely that KPLR would have been chosen over WRBU in any event, as channel 11 had been the higher-rated of the two stations even before it became a network affiliate upon joining The WB in January 1995 and had been one of The WB's strongest affiliates for the near entirety of that network's eleven-year existence. Subsequently, on February 22, 2006, News Corporation announced the launch of MyNetworkTV, a network operated by Fox Television Stations and its syndication division Twentieth Television that was created to primarily to provide network programming to UPN and WB stations with which The CW decided against affiliating based on their local viewership standing in comparison to the outlet that the network ultimately chose, allowing these stations another option besides converting to independent stations. On March 9, in a joint announcement by the network and Roberts Broadcasting, WRBU was confirmed as the charter MyNetworkTV affiliate for St. Louis. Channel 46 became a MyNetworkTV affiliate when that network launched on September 5, and concurrently rebranded as "My 46"; like other UPN-affiliated stations that were committed to join MyNetworkTV, WRBU ceased carrying UPN's prime time programming, resulting in the network's final two weeks of programming—which largely consisted of repeats of network shows aired during the 2005–06 television season—not being carried in St. Louis. KPLR, meanwhile, remained a WB affiliate until September 17, and officially affiliated with The CW when that network debuted the following day on September 18. As a MyNetworkTV affiliate, the station began serving as a backup NBC affiliate during occasions when KSDK (channel 5) was forced to preempt programs from that network due to