I think the announcers deserve a bit of recognition, too -- Charlie O', Jack, M.G., Jim, Johnny Gilbert, Don Pardo, and the various other substitutes over the years. Same goes for the behind-the-scenes staff, way too many to even begin a list but particularly Merv, Ed Flesh, John Lauderdale, Nancy Jones, and Harry Friedman.
And on top of it all, Lin Bolen, who commissioned what became
Wheel and willingly put her job on the line to get her bosses to put the show on the air after the disasters that were the 1973-74 pilots.
If, by Summer, you mean that time in 1982[...]
Maybe Brian was talking about the previous two times Summer filled in (September 1977 and May 1979), both while Susan was absent due to injuries? The latter period also had Cynthia Washington filling in, so there's another, and by all indication Arte Johnson also filled in during the former absence.
So yeah, there's a lot of people that have been involved over the past four decades. Happy birthday,
Wheel.