Special episode featuring the cast of Dallas (1978), but which also served as a reunion of sorts for series star Larry Hagman, who 15 years earlier had co-starred with "Squares" host Peter Marshall in two films, Ensign Pulver (1964) and The Cavern (1964), and had over a decade before this broadcast worked with center square Paul Lynde in three episodes of I Dream of Jeannie (1965).