the show was originally intended to premiere as a mid-season replacement in the spring of 1968, and the first 12 episodes were shot in the fall of 1967. this was changed and "giants" premiered in september 1968 for a full season. the network screened the episodes in a significantly different order than the production sequence. this caused disconcerting lapses in continuity, since in the first 12 episodes filmed (but not in later episodes) the giants moved slowly and hardly spoke. for example, "ghost town" was the 14th episode filmed (i.e. was "not" one of the original 12 episodes), but was the second episode aired.