Sesame Street Stays Up Late/The Big Bang Theory

Cast

 * Elmo as Sheldon
 * Big Bird as Leonard
 * Zoe as Penny
 * Telly Monster as Howard
 * Ernestine the Telephone Operator as Howard's mother
 * Prairie Dawn as Amy
 * Cookie Monster as Rajesh
 * Rosita as Leslie
 * Gina as Bernadette