| Hint | Answer |
| Portrayed by... | |
| Attempts to stabilise his regeneration in this portion of the TARDIS... | |
| Twice fought this malevolent serpent... | |
| First protecting this primitive people... | |
| The second, in aide to the people of this planet... | |
| Is more-or-less directly involved in the burning of this city... | |
| Loses his youngest companion due to the actions of this enemy... | |
| Picking up this old enemy who was stranded in the distant past... | |
| Ran afoul of this Time Lord Chancellery Guard... | |
| ...who was played by this future Doctor... | |
| Runs into this old comrade in two different parts of his timeline... | |
| Tried to remain on the good side of this legendary Time Lord (and his Game) with four of his former selves... | |
| One of two Third-Doctor-Era monsters who returned in 'Warriors of the Deep'... | |
| One of two Third-Doctor-Era monsters who returned in 'Warriors of the Deep'... | |
| The sole encounter with this old enemy is enough to scare one of his companions away for good... | |
| Crashes his TARDIS with with one belonging to this future self... | |
| Forced to regenerate due to... | |