The answer to the crossword for the term 'Hero of 'The Matrix'' is NEO, which is a three-letter word. NEO is the protagonist of the science fiction action film series The Matrix, released in 1999. He is portrayed by Keanu Reeves and is a computer programmer who learns his world is a simulated reality created by sentient machines. NEO is known as 'The One' and is destined to free humanity from the Matrix and end the war between humans and machines.