Alyssa Madison Davies

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 Second Lieutenant 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.

Encountering The Doctor
Alyssa met The Doctor in the year 2005. During an attempt to travel to the year 7500 AD, the TARDIS was struck by a violent solar flare burst from the Sun causing The Doctor to crash land in city of Summerlin, part of the metropolitan area of Las Vegas. Alyssa witnessed the TARDIS appear in a wash just outside of her residential development and The Doctor climb out. While trying to assist The Doctor, Alyssa was able to see inside the TARDIS and was eventually made aware of the The Doctor's origins as an extraterrestrial. Since, she has accompanied The Doctor on adventures across the universe and across time.

Alyssa repetitively joined The Doctor on adventures starting at the age of 16 and into her late 20's. On many occasions, Alyssa had met and also accompanied Rose Tyler, Jack Harkness, Mickey Smith, Martha Jones, Wilfred Mott, Amy Pond, Rory Williams, River Song and Clara Oswald on adventures with The Doctor.

Periods of time have elapsed between visitations by The Doctor and Alyssa. Following the events of Series 2 finale Doomsday, The Doctor returns Alyssa home. The Doctor would not return for Alyssa for three years. In the year 2008, then aged 19, Alyssa is no longer in high school and is instead a college student. She accompanies him on further adventures until the events of Series 4 episode Turn Left. The Doctor does not visit Alyssa for six years, returning for her in 2014, requesting her assistance during the events of Series 4 episodes The Stolen Earth and Journey's End. At the age of 25 in 2014, Alyssa is a Las Vegas Metropolitan Police Department officer.

During her travels with The Doctor at the age of 25, Alyssa is eventually provided UNIT privileges. Encounters with River Song and Jack Harkness end up gaining her access to a Vortex Manipulator and advanced weaponry designed for killing Daleks, Cybermen and Weeping Angels. Despite protests from The Doctor, Alyssa has become more vigilant about protecting and defending her home world, Earth, from the persistent assaults by aliens invasions and attacks, using violent and deadly force against hostile extraterrestrials who attempt to harm her planet.

Equipment
During her first time accompanying The Doctor at age 16, Alyssa is commonly in possession of the typical belongings of an American teenager, such as her cell phone, which The Doctor later modifies, allowing her to call home through space and time. She was usually armed with a switch blade and small canister of pepper spray. In the Series 1 episode World War Three, Alyssa pepper sprays a Slitheen. Alyssa sometimes carries a Zippo lighter.

During her adventures with The Doctor at age 19, Alyssa has an iPhone, which was modified by The Doctor, like her old phone, to be able to make calls through space and time. She remains armed on her travels with her switchblade and pepper spray. Alyssa uses a shotgun to destroy a Weeping Angel. She also drives a car. Alyssa's father, later eventually learning of her journeys through space and time, gives her a Glock 19 to protect herself and frequently carries the pistol. She uses the gun during the Sontaran invasion of Earth, shooting one in the head, killing it.

Upon The Doctor's return in 2014, at aged 25, Alyssa is a law enforcement officer with the Las Vegas Metro Police. She has access to a variety of vehicles, equipment, devices, weapons and tools. Besides her own car, Alyssa is featured in her LVMPD cruiser and rides a motorcycle, which she often brings into the TARDIS when travelling. When travelling with The Doctor, she is usually armed with two Beretta M9 semi-automatic pistols, which are later modified by UNIT to use Dalek Killer ammunition. She also keeps a UNIT-14 Pulse Carbine aboard the TARDIS, which she uses several times to fight off Cybermen and Daleks. Also while travelling, she keeps a tactical folding knife and an ASP baton on her waistband. Alyssa keeps a vortex manipulator device, which mimics a wrist watch, on her left wrist. Her iPhone has also been modified to function to a degree like a sonic screwdriver. As a police officer, Alyssa has access to the standard armory equipment of the Las Vegas Metro Police, including a variety of pistols, carbines, rifles, sub-machine guns, Tasers, flash-bang grenades and launcher fired grenade systems such as tear gas. On some occasions, The Doctor has requested the assistance of Alyssa while on duty, travelling in full LVMPD uniform and gear. During some encounters with hostile aliens, such as Weeping Angels, Alyssa uses a Kel-Tec KSG loaded with Dalek Killer shells to destroy them.

Skills
Alyssa has been trained by her father in hand-to-hand self defense, becoming proficient in Krav Maga by age 19. By age 25, Alyssa holds martial arts skills in both Krav Maga and Wushu Kung Fu. She is a trained expert marksman as an LVMPD officer. When she was 16, Alyssa's medical skill was limited to basic first aid and CPR. At age 25, Alyssa also has certification in EMS/EMT paramedic response. She is capable of flying the TARDIS and using sonic screwdrivers.