While Susan and David try to find a way out of London, Ian and Larry infiltrate the Dalek mine workings.
Did You Know?
Wells' role was originally much smaller - he was freed from the Dalek shuttle by Ian and left to tend to other escapees. See more
The timer on the bomb is inconsistent between shots. This is due to the use of a polystyrene prop when David uses acid to disarm the device. See more