Art Linkletter was assisted by Bob Cummings and Ronald Reagan, and the program featured various other guests, including various appearances of Walt himself as he dedicated the various lands of Disneyland. In 1958, the series was retitled "Walt Disney Presents" and moved to a Friday-night timeslot; by 1960, ABC had switched it to Sunday nights, where it remained for 21 years. During this iteration, "The Peter Tchaikovsky Story," an episode made to promote Walt's latest animated feature, "Sleeping Beauty", was one of the first stereo simulcasts on TV; in this case it was 3 channel stereo. FM radio stations across the country carried the left channel at the same time as ABC broadcast the TV show in mono, which served as a center channel, and AM radio stations broadcast the right channel. In the second half of the show, a lengthy clip of "Sleeping Beauty" was shown, with its 6 channels (70mm version) mixed down into 3 for the broadcast. Walt apparently wanted people to see "Sleeping Beauty" in 70 mm, so, in the introduction, he explained the difference between 35 mm and 70 mm and held up a card with both sizes on it. In addition to episodes devoted to the latest additions at Disneyland, many episodes during this period were Westerns such as "Texas John Slaughter" and "Elfego Baca", while others talked about the United States' burgeoning efforts to explore outer space and others, such as "Moochie of the Little League", were set in the then-present day. Some episodes even mixed live-action and animation, showing Mickey Mouse, Donald Duck, Goofy, and Jiminy Cricket talking with Walt himself, while one 1959 episode turned the spotlight on Chip 'n' Dale, combining their theatrical cartoons with mixed media wrap-around footage. Although the basic format remained the same, the series moved to NBC on September 24, 1961, to take advantage of that network's ability to broadcast programming in color. In addition, Walt Disney's relationship with ABC had soured as the network resisted selling its stake in the theme park before doing so in 1960. In a display of foresight, Disney had filmed many of the earlier shows in color, allowing them to easily be repeated on NBC; since all but three of Disney's feature-length films were also made in color (the three black-and-white exceptions were "The Shaggy Dog", "The Absent-Minded Professor", and "Son of Flubber", all family comedies starring Fred MacMurray), they could now also be telecast in that format.