This series, which has a close cousin in The Secret Life of Walter Mitty (1947), Billy Fisher works as a mortician's assistant but dreams of glory. He's so immersed in his fantasy world that his family rationalizes his odd behavior as best they can. He has a staunch supporter in his mother (Peggy Pope), though. Viewers were treated to big budget enactments of his imaginings, including jousting, parades and celebrity guests. The series didn't run for long. It was cancelled after the 7th episode.
There is no DVD collection available commercially and episodes can be hard to come by. Above is a compilation of show opens from '79 and this one is included in it (as is Vega$ - yesterday's feature on the blog).
Obscurity factor: 10 (hard to find, not on DVD or YouTube in full, not well remembered)