The robots are equipped with Spray Starch to take away Captain Underpants's powers, once they hear the word "Tra-la-la!", they will spray the spray starch.
The robots are equipped with Spray Starch to take away Captain Underpants's powers (as George and Harold wrote in their comic book for Ms. Ribble). Once they hear the word "Tra-la-la!", they will spray the spray starch.