Last show of the series.
Patrick Duffy's first appearance as "Bobby Ewing" on the premiere of "Dallas" (aka "Digger's Daughter") premiered on April 2, 1978, over two months prior to this final installment of "Man From Atlantis" on June 6, 1978. Also, as part of the plot for this show, Mark gets billed at the carnival as the "Man From Atlantis" and fields questions from spectators about his origin, elements not really discussed since the pilot.