Roddy McDowall / Planet of the Apes
Transforming the cast for Planet of the Apes was a monumental task requiring much prosthetic work. John Chambers was the top dog for makeup artistry for the movie, and he wanted all the actors to know what they were getting into before signing on.
Apparently, many actors passed on the opportunity once they heard how much time was needed for makeup. But luckily, Chambers and producer Arthur Jacobs agreed that the actors needed to be somewhat visible under all that hair and makeup, so viewers could still relate to the characters.