Don Knotts was an American actor and comedian, best known for his roles in The Andy Griffith Show and Three's Company. He also starred in a number of films, including The Incredible Mr. Limpet and The Shakiest Gun in the West. In 1964, he starred in a film called The Reluctant Astronaut, in which he played a dentist who is recruited to become an astronaut.
The Reluctant Astronaut was a critical and commercial success, and it helped to cement Knotts' status as a major star. The film is notable for its clever script and Knotts' hilarious performance. It is also one of the few films in which Knotts played a leading role.