Astonomer Professor Richter believes that the sun's stellar companion, a white dwarf, is returning to the solar system. If it does, that's the end of everything. So why on Earth would anybody want to murder him now?
| Creator | Sydney Newman |
|---|---|
| Actor | Patrick Macnee, Linda Thorson |
| Country | United Kingdom |
| Production | Associated British Picture Corporation |
| Season 1(26 episode) |
|---|
| Season 2(26 episode) |
| Season 3(26 episode) |
| Season 4(26 episode) |
| Season 5(24 episode) |
| Season 6(33 episode) |
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