Morrax

Morrax was the home world of the Morraxians, orbiting Epsilon Eridani. In the 1970s, it was devastated by accelerated radio waves sent from Dr. Louis French's radio telescope. The Doctor arrived on Morrax to investigate the damage done, and prevented the Morraxians from taking revenge on Earth. He then worked with them to construct a time reverser to undo the damage the radio waves caused. (TVC: Is Anyone There?)