Fiction Contents Blish, James, --Return to Tomorrow (#51, Gene Roddenberry and John T. Dugan), 1973. (TV: first aired on March 8, 1968) --The Ultimate Computer (#53, D. C. Fontana and Laurence N. Wolfe), 1973. (TV: first aired on February 9, 1968) --That Which Survives (#69, John Meredyth Lucas and D. C. Fontana), 1973. (TV: first aired on January 24, 1969) --Obsession (#47, Art Wallace), 1973. (TV: first aired on December 15, 1967) --The Return of the Archons (#22, Boris Sobelman), 1973. (TV: first aired on February 9, 1967) --The Immunity Syndrome (#48, Robert Sabaroff), 1973. (TV: first aired on January 19, 1968)