“”””We still have them here, where they are called Frisch’s Big Boy.”””””
In North Dakota in the 1970’s it was McDowells Big Boy.
IIRC, you could get a pizza burger, flying saucer style.
Around here Eat n’ Park was a Big Boy franchisee for a long time. They dumped out of that around 1970. Then Elby’s Big Boy from West Virginia came in, but those went away around 15 years ago when the franchisee went bankrupt.