Jonathon St. Claire is a French treasure hunter and rival to Pitfall Harry.
He is willing to do anything to find the treasure he is after, including torturing the locals.
He initially teams up with Pusca who believed he may be the man from the prophecy who was foretold to bring the Time Stones back to El Dorado. Pusca ends up killing him and taking control of his army.
- St. Claire is possibly an homage to Rene Belloq, the main antagonist from Raiders of the Lost Ark, Like Belloq, given his nationality.