An uncredited extra is a performer who is shown in episodes of Desperate Housewives as either a background player or a stand-in for the main stars. Uncredited extras are, therefore, "actors" who will be seen in every single episode but won't have any speaking parts and will not be credited along with the main, supporting and guest castmembers. Such extras are usually featured in crowd shots, in walk-on parts, and sometimes they step in for the main actors when a particular episode doesn't require the actual star to play the role.