Hop Sing was the fictional Cartwright family's cook on the US television series Bonanza which ran on the NBC network from 1959 to 1973. US-born actor Victor Sen Yung played the character, who was a Chinese immigrant.
A servile character named Hop Sing first appeared as a laundryman in 1876, in Bret Harte's play Two Men of Sandy Bar. Folklorist Wolfgang Mieder cites his comically accented Pidgin English diction as the likely source for the proverbial ethnic slur, "No Tickee, no Washee". Although in his considerably toned down reincarnation as a TV character, the character of Hop Sing still incorporated some Chinese-American stereotypes, such as being a servant (an economic niche also shared by African Americans in the American South), he is not commonly cited as an offensive use of an Asian (known as Oriental at the time) character. The Chinese were historically marginalized in the labor market of the American west into niches where they would not compete with Caucasians. Marlo Thomas was once cast as a militant Chinese woman. Some prominent Asian-Americans, such as Benson Fong, would also appear on Bonanza.
The character had to deal with bigotry on occasion. In "Shanklin" episode #409, he is repeatedly referred to by a confederate doctor as "yellow", to which a Cartwright states, "He's not a yellow, he's Chinese". During the western's fourteen-year run, just two episodes centered on the character. The first episode, #316 was "Mark of Guilt" which dealt with Hop Sing clearing Little Joe of a murder charge via the ancient science of fingerprinting- or (as Hop Sing termed it) "chops". The second episode, #404 was "The Lonely Man", which chronicled legal biases against Asians, when Hop Sing unlawfully gets engaged to a white woman.