James Whitmore stars.
When casting his planned Davy Crockett episode of the Disneyland television show, Walt Disney viewed the film to see James Arness who had been recommended for the role. However, Disney was impressed by a brief scene of Fess Parker insisting that he saw the giant flying ants despite being held in an institution. Disney realized he had found his Crockett.
Star Trek's Leonard Nimoy also has a part in this movie. Just to bring yet another genre mention into the mix you can see Nimoy sing The Ballad of Bilbo Baggins here: