TV Database Wiki
Includes a running list of characters who are only known by the name of Gretchen.

Two and a Half Men[]

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Gretchen is a fictional dominatrix and a minor character featured on the CBS comedy series Two and a Half Men. Played by actress Erinn Hayes, she appeared in the fifth episode of season eight, "The Immortal Mr. Billy Joel". Gretchen was a German woman and a former lover of Charlie Harper. Gretchen met up with Charlie's brother, Alan, at a bar where Alan was pretending to be Charlie while Charlie was away in Las Vegas. Alan struck up a conversation with Gretchen, but quickly learned that he was living inside a German nightmare.