In 1995, Viacom and Chris-Craft Industries' United Television launched United Paramount Network (UPN) with Star Trek: Voyager as its flagship series, fulfilling Barry Diller's plan for a Paramount network from 25 years earlier. In 1999, Viacom bought out United Television's interests, and handed responsibility for the start-up network to the newly acquired CBS unit, which Viacom bought in 1999 – an ironic confluence of events as Paramount had once invested in CBS, and Viacom had once been the syndication arm of CBS as well. During this period the studio acquired some 30 television stations to support the UPN network as well acquiring and merging in the assets of Republic Pictures, Spelling Television and Viacom Television, almost doubling the size of the studio's television library.