Sheppard: Mr Freeze. No! King Tut.
McKay: Wrong on both. Otto Preminger was Mr. Freeze; Victor Buono was King Tut; Vincent Price was Egghead.
Sheppard: Egghead! Right!
McKay: OK, so: Cliff Robertson.
Sheppard: Oh, I know this one. Played the cowboy, right?
They are referring to the villains in the 1966 TV series Batman and the actors that played them.