Dr. Alexander Graham Nitwhite (often mispronounced as "Dr. Nitwit", which he hates being called, by his duck assistant, Watson and sometimes by other characters: a regular routine has Theo and Cleo saying hello to "Dr. Nitwit" and when they are corrected (Nitwhite) they proclaim "Right...") is a pelican scientist.
In his skits, he announces to Watson that he's discovered "the only word in the entire English language" with a certain letter combination (which is nearly always related to the lesson of the whole episode). However, his "discoveries" always turn out to be incorrect, as Watson inadvertently points out; as such, his nickname is rather apt. His name is a pun on Alexander Graham Bell, the creator of the telephone. He is performed by Tyler Bunch.