Nikola Messla is a Grouch professor at "Putrid University" (P.U.) who appears in episode 4260 of Sesame Street.
Oscar takes the online Grouchology class from the college, learning how to be a Grouch scientist. Messla instructs Oscar at his trash can, via webcam, helped by the Pesties.
His name is a reference to Nikola Tesla, a well known scientist & inventor.
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