Kurt (Shakedown: Return of the Sontarans)

Kurt was a very wealthy businessman, with a very shady past.

Biography
Kurt once encountered the Seventh Doctor during a Sontaran invasion of a human occupied world. The Doctor was there fomenting rebellion against the humans, and then promptly switched his focus to the Sontarans upon their invasion. Kurt was a smuggler who ended up in a cell with "the infamous rebel general Smith". (PROSE: Shakedown)

Kurt was part of Lisa Deranne's Tiger Moth crew. He and Lisa were the only two to survive when Sontarans boarded their solar-yacht searching for a Rutan agent, though Kurt sustained a wound to his shoulder from Steg, and they resolved to hire a new crew and re-enter the solar-yacht races as business partners, though Kurt hoped they would enter a romance. (HOMEVID: Shakedown: Return of the Sontarans)