Lt. Colonel Percival Harrison Fawcett was a British artillery officer, archaeologist and explorer who disappeared in the jungles of Brazil in 1925 while seeking El Dorado. He served in Ceylon, trained as a surveyor, and worked for the British Secret Service in North Africa. He also befriended H. Rider Haggard and Arthur Conan Doyle (who was inspired by tales of Fawcett's Amazonian expeditions to write, "The Lost World"). He claimed to have shot at a 62-ft. long giant anaconda, reported small cat-like dogs, and said he had seen the giant Apazauca spider as well. We know he actually stumbled across several cryptids before TimeWatch recruited him.
Percy Fawcett on Wikipedia