Details of the story differ, but the most common version has him shipwrecked on a small island in the Caribbean off the coast of Nicaragua, sometime in the 1520s.
Serrano survived by eating shrimp, cockles, and other animals he found washed up on the shore, and by collecting drinking water in sea turtle shells when it rained.
Due to Serrano's isolation and unkempt state, both men initially mistook one another for the Devil, and quickly fled from each another.
After receiving a sum of 4,000 pieces of eight from the King of Spain, Serrano sailed to the Americas to collect the money, but died during the voyage.
[1] The tale of Serrano may have been loosely based on the historical case of "Maestre Joan", who in 1528 was stranded on cay now named Serrana Bank, and was rescued eight years later.
[2] One such work is the comedic poem Etiquette, written in the 19th century by the librettist W. S. Gilbert, which heavily adapts Serrano's story as a satire of Victorian era social customs.
A boat from the vessel rows past, and they are horrified to discover that none other than their mutual friend, Robinson, is pulling the oar.