When Taylor, Nova, Zira, Cornelius and Lucius made their daring escape into the Forbidden Zone, they were pursued by Dr. Zaius along with a group of gorilla "Security Police", including Marcus and possibly Xirinius. One of the group was considered enough of an expert marksman to be sent up the cliff face overlooking the cave where the fugitives were hiding, in order to shoot Taylor when he emerged. He missed, however, and was forced to withdraw when Zaius was taken hostage.
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