Shallo

Shallo was a Sontaran Commander during the Sontaran invasion of Earth, as part of their plot to use the Flux to become the dominant species in the universe. Whilst stationed on Earth, Shallo developed a taste for Earth chocolate, over time it became an addiction, to the point that he dismissed his soldiers to engage in looting a corner shop and gorging himself on the confectionery. He was caught by the Thirteenth Doctor, Yaz and Dan, who promised him all the chocolate he could want, in exchange for Claire and Professor Jericho. (TV: The Vanquishers)

Behind the Scenes

 * Commander Shallo was portrayed by veteran Doctor Who actor Dan Starkey who is well known for portraying several Sontaran characters, most notably Skorr and Strax.
 * It remains unknown as to what exactly happened to Commander Shallo after the Sontaran Fleet was defeated, however it can be assumed that he was mostly likely captured and imprisoned by UNIT by the time the Flux was destroyed.