Gebra

 was a Dindrinine encountered by the Thirteenth Doctor along with his ally Hurum.

History
Gebra and Hurum were the last survivors of the Fourth Fleet of Dindrinous Beta. After engaging in a war, their forces were left ruined, leading to them meeting the Thirteenth Doctor, who promised to get them help from their people, depositing them at the Gardens of Everlasting Summer.

However, after the Doctor left them, no help came, forcing them to fit in disguised as an elderly man and woman. When the Doctor returned to investigate the gardens with Yasmin Khan and Dan Lewis, she had forgotten all about them and their plight, leading to them harbouring a deep resentment for her and trying to kill her several times. When the Doctor uncovered Jinpar's manipulation of time in the gardens, she realised that their recovery ship simply missed them during the time storm, leading to them sheepishly forgiving her and her offering to take them home in her TARDIS. (COMIC: The Everlasting Summer)