Valentine Michael Smith is a fictional character from the science fiction novel "Stranger in a Strange Land," written by Robert A. Heinlein. He is a human raised by Martians on the planet Mars and returns to Earth as an adult. His unique upbringing gives him extraordinary abilities and a different perspective on human society. Upon his arrival on Earth, Valentine struggles to understand human customs and language. He becomes a central figure in exploring themes of love, religion, and social norms. His experiences challenge the beliefs of those around him, leading to significant cultural and philosophical discussions.