According to Michael Gray in an interview in 2012, They filmed Shazam! during the summer time and shot within an hour, hour and a half from the studio in the Los Angeles Valley and they did an episode in two and a half days. Some of the crew worked on the Lassie TV series. See more
[Opening title narration
Chosen from among all others by the immortal elders - Solomon, Hercules, Atlas, Zeus, Achilles, Mercury - Billy Batson and his mentor travel the highways and byways of the land on a neverending mission: to right wrongs, to develop understanding, and to seek justice for all! In time of dire need, young Billy has been granted the power by the immortals to summon awesome forces at the utterance of a single word!
A word which transforms him, in a flash, into the ...