runners being Nolte and Voight  after the role was turned down by Beatty and Redford. Among the  unknowns tested for the role were Ilya Salkind (qv)s wifes  dentist (footage of the dentist testing for the part of Superman  can, in fact, be seen in the supplemental section of the DVD).  Eventually, the Salkinds cast an almost unknown actor they kept  coming back to from earlier in their search 