Looking at
this episode guide, these hosts (or hostesses) appeared during the ABC run:
Bill Cullen, Merv Griffin, Arte Johnson, Betty White, Carl Reiner, Dick Martin, Monty Hall, Art Linkletter, Soupy Sales, Ruta Lee, Rod Serling, Tom Kennedy, Gene Rayburn, Bert Convy, Dick Gautier, Larry Blyden, Vicki Lawrence, Richard Dawson, Nipsey Russell, Pat Harrington, Allen Ludden (when Monty Hall took over as host and once when Betty hosted as well), Don Galloway, Bobby Van, Arlene Francis and Elaine Joyce.
-Jason