Polaris

Polaris (冷凍惑星, Reitō Wakusei) is a planet with a very cold climate, shown in the Baby Saga of Dragon Ball GT.

Overview
Pan, Trunks, Goku, and Giru go there to retrieve one of the last Black Star Dragon Balls, the Two-Star Ball. On the planet, Giru calculates the temperature around -272 degrees, without precising the scale (Celsius or Fahrenheit). This means Polarsis could either be at almost sub-zero temparutres, to being cold enough to instantly freeze carbon dioxide.

Video games
Polaris also appears as the tenth level in the Game Boy Advance game Dragon Ball GT: Transformation. Enemies encountered here are Polar Zoonamites, Thundra Wolves, Icicles, Ice Crabs, Hornets, and the boss is a Yeti Beast.