The Barter
The barter is a timelord from Jonizicrey that does nature experiments without regard for the species that the experiments are being done on. The Jacksoner has had to stop him a few times cause of the most extreme experiments on Earth and other places. They had clashed a few times some of his experiments went into the political world and the Jacksoner had to stop those too and Jouroctor and the Jacksoner sometimes had to team up to stop him a few times. The brotherhood of Aven a group of time lords related to Karn it's sibling planet that does exchanges with them had to intervene a few times as well.