In 2526, eight Earth paleontologists and geologists were investigating a fossil found in a newly discovered cave when seven of them disappear. The only one who seems to have got out is Professor Kyle. She accompanies Lt. Scott and his troop of soldiers into the unmapped caves to see if they can find her colleagues. What they find, however, is the Doctor and his traveling companions Nyssa, Adric and Tegan, who have also just arrived in the TARDIS. They're near the location where the scientific expedition was attacked and Scott suspects the Doctor. There are others in the subterranean structures however.
Did You Know?
Winner of the Doctor Who magazine best Story in their Season Poll. See more
When the troopers are in the caves, the two dark figures in background walk past (to the right) and one of the troopers stops and turns around. As he does this the shadow of a crewmember can be briefly seen on the left wall. This is not the dark figure's shadow because they have already walked past. See more
Anything we can do to help?
[Scott forcefully grabs the Doctor