Dastardly and Muttley were set to appear in the show where they were to be the bodyguards of a younger brother of Penelope. However, this was only in the first sketches of the series, and the two did not appear in the final work.
Notice how the villains name is the Hooded Claw yet he's not wearing a hood and doesn't have a claw.
Throughout the series, Paul Lynde does not appear in the voice credits.
The Hooded Claw: Who were you expecting, Dick Dastardly?
Adapted into the comic book story "The Hooded Claw's Sinister Plot" (Hanna-Barbera Fun-In #1, Gold Key, February 1970).