in used for many shots with the face hidden and lines dubbed.  The next episode, "The Menfish", had Nelson away and his lines  reassigned to guest character Adm. Park (Gary Merrill (qv)). The  following episode, "The Mechanical Man", had Nelson still away and  reassigned his lines to Capt. Crane (David Hedison (qv)) and  Cranes lines to Cmdr. Morton (Robert Dowdell (qv)). Basehart  returned in time to appear in the seasons last episode, "The Return  of the Phantom."