Overview
Jamie tries to evade Yeti in the tunnels of the London Underground. Meanwhile, The Doctor and Victoria meet a potential new ally - Colonel Lethbridge-Stewart.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 101 | March 28, 1987 (67) | |
 | 76 | 80 | |
 | 73 | July 21, 2017 (69) | |
 | 91 | February 22, 2011 (81) | |
 | 98 | May 22, 2001 (78) | |
 | - | - |