Steve (The Honourable Burger)
Steve was a Sontaran who attempted to settle on Earth before being stopped by the Tenth Doctor.
Since the start of his life, Steve had dreamed of using his strongly-held-beliefs of honour and war tactics to the benefit of others. At some point, he left the battlefield of his fellow Sontarans to instead seek out a peaceful life on Earth, where few knew of his true species. He opened a burger van in a Welsh deer park, but he insisted on only serving the meat of the dead deer which he had personally hunted out of personal honour. This led to a sign being placed in the park which read, "Please Don't Eat the Deer. Frankly we're surprised we even had to write that down."
The Tenth Doctor discovered his food truck and initially was accepting of his settled, commercialised life. However, he was horrified to hear that Steve was using the deer to create the burgers, and he knocked him out by hitting his probic vent with a spatula. (COMIC: The Honourable Burger)