The Big Bang Theory Wiki

"Robin Hood" is a mythical hero and outlaw in English folklore and later literature and the movies and television. He is skilled at archery and sword play and after stripped of his birthright and property, rounds up a band of men to fight the injustices of the Sheriff of Nottingham and King John. The Sheriff is shown assisting Prince John plundering the kingdom in the absence of her brother King Richard who is off fighting the Crusades in the Holy Land. His true existence is widely debated and most of the common tropes of him and his adventures date from movies made in the 20th century.

In "The Middle-Earth Paradigm", Howard dresses up as Robin Hood for Penny's Halloween party and is mistaken for Peter Pan.