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