Brothers of Hame

From TARDIS Index File, the free Doctor Who reference.

The Brothers of Hame were an organization in the year 5 Billion CE that were dedicated to creating a sentient race. They had bought the Panjassic Asteroid Field, and started experimenting on trees. Their result was the Forest of Cheem, but the forest had enough of the Brothers' rule and asked to be set free. The Brothers accepted. (REF: Doctor Who: Monsters and Villains)