Carla Dalton

In an alternate timeline in which the UK-201 never crashed on Dido,  was the daughter of Vicki Pallister and Jeran Dalton, together with her sister Maria Dalton. Several modifications to the timeline by Vicki created further branching timelines which affected Carla's life.

First and second timelines
Carla's parents met when her grandfather, Newton Pallister, was killed by a meteor shower. Jeran comforted the grieving Vicki and in later years they married, eventually giving birth to two girls, Carla and Maria.

Carla grew up to work as a medic. She left to perform humanitarian duties in Astra's Outer Provinces when they were struck by an outbreak of space plague. However, the Provinces were attacked by rebel forces and Carla was killed. Her dead body was recovered and the news was passed on to her family. Vicki was overcome with grief.

Maria, as governor, was later able to negotiate peace with the rebels. Vicki and Jeran rarely talked about Carla after her death.

In a second timeline created when Vicki learned she could change how pivotal moments of her life played out, she prevented Jeran's death from space plague and spoke to him about Carla for the first time in years. Vicki then decided to go back and save Carla's life as well.

Third timeline
Vicki she travelled back in time to prevent Carla from leaving for the Provinces. Vicki warned Carla about the imminent rebel attack and in the ensuing argument, Carla missed her transport. Carla burst out that she would never forgive her mother, although Vicki was confident Carla would understand when the time came.

Later, the rebel attack was reported on the news. Carla called Vicki and demanded to know how she knew it would happen, although she was still not pleased with her mother for the turn of events.

Although Carla survived, the rebels gained the upper hand in the new timeline. Maria never became governor and could not negotiate peace. Carla and her family became refugees as the government was on the cusp of surrender.

Fourth timeline
After Vicki saved her father from the meteor shower, she never met Jeran. Carla was never born.

Fifth timeline
Vicki tried to meet Jeran again and return to her family life but very subtle changes to the course of events, together with pure chance, meant that Carla was never born. Instead, Vicki gave birth to a boy named Carl. Vicki was horrified by the realisation that she could never see her daughter as she knew her again. This convinced her to return to the UK-201's fateful flight and allow the prime timeline to play out.

Prime timeline
After Vicki escaped the alternate timeline and returned to travelling with the First Doctor, Carla never existed. Vicki, however, could still remember her experiences and chose to preserve the memory of her family. (AUDIO: The Crash of the UK-201)

Vicki eventually left the Doctor's company and married Troilus in 12th century BC, with whom she had two children. (AUDIO: Frostfire)