Praska

 was an Aquillian. She knew that the Seventh Doctor would ruin their plans. She used Rufus Stone as a conduit to carry out those plans. She followed the Doctor's travels throughout all his lives. She protected the north from alien invasions. She said that they hyrodine were coming. She said To'Koth was dying. She could telepathically communicate with the Doctor. She said that Hex was a distraction for the Hyrodines. She explained to Rufus that To'Koth's death was what was affecting the Earth and rthey wanted his powers. She was impressed by the Doctor's TARDIS. (AUDIO: Signs and Wonders)