Burroughs sold Lesser options on all his Tarzan novels for seven years with Lesser producing one Tarzan film a year for 20th Century Fox. Only one Tarzan film Tarzan's Revenge featuring athletes Glenn Morris and Eleanor Holm was produced; Lesser sold the rights back to MGM.
For seven years, Burroughs gave Lesser the option to adapt his Tarzan novels into films.  Lesser fulfilled this agreement by producing a single Tarzan movie each year for 20th Century Fox. The only film made under this arrangement was "Tarzan's Revenge," starring athletes Glenn Morris and Eleanor Holm. Ultimately, Lesser returned the rights to MGM.