Overview
When scientists in the Antarctic uncover a mysterious seed pod, the Doctor is called in to investigate. He soon realises it is extraterrestrial and extremely dangerous. At the same time, however, ruthless millionaire plant-lover Harrison Chase has learned of the find and decides he must have the pod for his collection of rare and beautiful flora. Meanwhile the pod itself harbours intelligent life with sinister plans of its own...
| Actor | Age then | Age now | |
|---|---|---|---|
 | 42 | 91 | |
 | 27 | April 18, 2011 (63) | |
 | 46 | April 19, 1980 (50) | |
 | 44 | October 29, 2015 (84) | |
| 50 | June 5, 1988 (63) | |
| 66 | May 31, 1986 (76) | |
 | 33 | September 19, 2021 (79) | |
 | 36 | January 14, 2010 (70) | |
| - | - | |
| - | - |