Journey to Krull - The Making of the Film (1983)
https://www.youtube.com/watch?v=_MXYNyv6oeE&list=PLYn2a0e2FVIJ66EP8vMU64l-kIhHU9zg7&index=5&t - from the EndsAndOdds YouTube channel (22 mins long).
The blurb:
“A behind-the-scenes look at the 1983 fantasy film Krull. Narrated by Tom Bosley.”