British director John Guillermin was not entirely certain of how to make the character of Tarzan contemporary with the tendency towards realism...
Pulled by Sly Weinhaub's great vision, they made the Ape Man literate, but still disposed to chest-beating and ape-calls...Their screen treatment provided a 90 minute superior action film tightly interwoven and very entertaining...
"Tarzan's Greatest Adventure" quick-paced action is supplemented with violence and, in the absence of the wholesome Jane, we get two sexy women, a sensual Italian (Scilla Gabel) for the villains and a gaily blonde named Angie (Sara Shane), as the romantic interest for Scott who gives an excellent characterization...
The villains are four different British types: Slade (Anthony Quayle), Kruger (Nial McGinnis), O'Bannion (Sean Connery), and Dino (Al Mulock). In raiding a settlement for explosives to use in a diamond mine, they practically destroy it... Tarzan, discovering the cruelty, pursues them upriver to their mine...
For his parts in "Tarzan's Greatest Adventure," Sean Connery earned $5,600; his 'big' Bond film "You Only Live Twice" brought him $350,000.