William Biggers, who co-created The Underdog Show, died Feb. 10 at age 85.

According to TV Guide, “Biggers was working at a New York City advertising firm when he was assigned to create cartoon characters to promote breakfast cereals for the company’s biggest client, General Mills. Among his ideas was Underdog, which debuted on NBC in 1964 and featured a canine superhero who was voiced by comedian Wally Cox. In the cartoons, Underdog often battled villains when coming to the rescue of his girlfriend, Sweet Polly Purebred.”

Underdog debuted October 3, 1964, on NBC and continued in syndication until 1973. It has an awesome theme song:

Opening, The Underdog Show

When criminals in this world appear
And break the laws that they should fear
And frighten all who see or hear
The cry goes up both far and near
For Underdog! Underdog! Underdog! Underdog!

Speed of lightning, roar of thunder
Fighting all who rob or plunder
Underdog! Underdog! Underdog!