Operation (game) amongst the players at the beginning of the game. In the U.S and Australian version, players take turns picking "Doctor" cards, which offer a cash payment for removing each particular ailment, using a pair of tweezers connected with wire to the board. Successfully removing the ailment is rewarded according to the dollar amount shown on the card. However, if the tweezers touch the metal edge of the opening during the attempt (thereby closing a circuit), a buzzer sounds, Sam's nose lights up red, and the player loses the turn. The player holding the "Specialist" card for that piece then has
Invasion of the Body Snatchers budget, however, he abandoned these choices and cast Richard Kiley, who had just starred in "The Phenix City Story" for Allied Artists. Kiley turned the role down and Wanger cast two relative newcomers in the lead roles: Kevin McCarthy, who had just starred in Siegel's "An Annapolis Story", and Dana Wynter, who had done several major dramatic roles on television. Future director Sam Peckinpah had a small part as Charlie, a meter reader. Peckinpah was a dialogue coach on five Siegel films in the mid-1950s, including this one. Originally, producer Wanger and Siegel wanted to film "Invasion of the Body