Zeta Minor

Zeta Minor was the planet farthest out in the known universe. It contained a link to a universe of anti-matter. Zeta Minor's surface contained a jungle-like terrain and was home to anti-matter creatures.

In the year 37 166 the Fourth Doctor and Sarah Jane Smith responded to a distress call from Zeta Minor. A space crew landed shortly after their arrival on the planet. (DW: Planet of Evil)