Hoster

Hoster, along with Roanna and Wyler were scientists on the planet Medrüth who found themselves trapped in their own underground laboratory. Hoster, along with Roanna and Wyler worked at a research and development lab which created containment units for star drives, however when the The Yearn started to make the Medrüthians disappear, the lab instead focused it's efforts on researching weapons to combat the Yearn. One night, a research team discovered that Zelanor energy might disrupt what the Yearn were made of, but the next morning most of the team had disappeared. When the Doctor and Valarie Lockwood arrived, Hoster immediately distrusted them, until Roanna later convinced him they were worth trusting. When the Doctor and Valarie defeated the Yearn, Hoster remained behind with the others to help stabilize Medrüth. (AUDIO: The Yearn)
Later, Hoster was part of the last line of defense when the New Dalek Paradigm invaded Medrüth. Medrüth was very quickly decimated by the Daleks, and Hoster was once again one of the last survivors when the Doctor arrived. All they could do was try and slow the Daleks down. He and Hayden Lockwood worked to try and evacuate the civilians on a transport ship while the Doctor distracted the Daleks, but this failed; the ship was shot down and all aboard, including Hoster and Hayden were exterminated. (AUDIO: Daleks Victorious)