Alyssa Madison Davies is a human being and companion of The Doctor. Alyssa was born on June 16, 1989 in Las Vegas, Nevada. She has since been raised and continues to live in the city of Las Vegas. Her mother mysteriously disappeared in 1994, leaving her to be raised alone by her father, a Major in the United States Air Force, stationed at Nellis Air Force Base. Alyssa met The Doctor in the year 2005, at the age of 16, and has since repeatedly accompanied him on exploring space and time.