The "botched" sigma experiments were conducted by humans in the 30th century. The Seventh Doctor noted this as being when humans were due to develop time travel. (PROSE: Transit)
- Presumably a typo, "sigma" may actually refer to "zygma."
The "botched" sigma experiments were conducted by humans in the 30th century. The Seventh Doctor noted this as being when humans were due to develop time travel. (PROSE: Transit)