Tharia is the third child and youngest daughter of John Carter, the legendary Warlord of Mars. She grew up hearing stories of her father's home world, and was curious about it from an early age. Martian science had developed viewers that allowed observation of Earth, and she studied the world intently. Her curiosity got the better of her, she began studying the same psychic techniques her father had learned to transport himself across the void. After an intense study, Tharia teleported herself to Earth, arriving in her distant cousin Burroughs home. Her cousin welcomed her and helped her become accustomed to life on Earth.