The TARDIS lands on Earth six years out of date, stranding the Doctor in 1983 while leaving Tegan and Nyssa to look for him in 1977, eventually to discover a badly injured man that may very well be the Doctor. Both parties also encounter former Doctor-companion Brigadier Lethbridge-Stewart, though in 1983 he curiously has no memory of the Doctor at all. Written by
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[Thanks to the Doctor, the Brigadier regains his memory
Brigadier Alistair Gordon Lethbridge Stewart
Well, bless my soul. So, you've done it again, Doctor.