Question: When was the director of film Mutant Aliens born?
Sentence (from "Bill Plympton"): Bill Plympton (born April 30, 1946) is an American animator, graphic designer, cartoonist, and filmmaker best known for his 1987 Academy Awards-nominated animated short "Your Face" and his series of shorts "Guard DogGuide DogHot Dog", and "Horn Dog".
Relevant evidence: Yes