The earth's crust has been penetrated and, while the Doctor and Greg try to contain the disaster, the Doctor begins to realise the planet has passed the point of no return.
Did You Know?
There was originally a scene in the parallel universe where the characters listen to a radio broadcast where Jon Pertwee
played the radio announcer in an imitation of Nazi propagandist William Joyce. It was cut from the British broadcast, as Pertwee's voice was too recognisable, but was included in the US broadcast, as it was thought that the audience there wouldn't be familiar with Pertwee's comedy work. See more
It's marvelous, isn't it? The world's going up in flames and they're still playing at toy soldiers!