- Sir Humphrey Pumphrey - An evil antagonistic archaeologist/graverobber. Rupert met him in Egypt, when Sir Humphrey drained the Nile in an attempt to get a museum to put all of its treasure back into a tomb so he could steal it more easily. Unfortunately for him, he was stopped by Rupert and a poor boy who offered rides on his camel. He and Rupert met again when he was using a sub to vacuum the ocean floor for sunken treasure. When he heard from Rupert and a merboy that he was trespassing near Neptune's treasury, he took the chance to steal Neptune's treasure, until he was stopped by Rupert, the merboy, and the captain. He often wishes to plunder the riches of the world for his own greed.
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