The man behind beloved character Elmo is being sued by Sheldon Stephens, who claims he became involved in a sexual relationship with Clash after meeting the star at an actors' function when he was just 16 years old.
Stephens alleges Clash smoked crystal meth during their intimate meetings and also gave the teen amyl nitrate to enhance their sexual relations.
According to Tmz.com, Stephens' complaint also accuses Clash's unidentified limousine chauffeur of performing a sex act while watching them getting intimate.
Stephens previously recanted his account after reaching a settlement with Clash, but Tmz editors report he turned his back on the agreement because it required him to admit making up the allegations.
Stephens is now suing because the settlement money was never paid.
Clash resigned from Sesame Street in November (12).