(The DOCTOR gets to his feet.) He's only concerned with his own safety. Of course! The BRIGADE LEADER starts to fire his extinguisher at the growling creatures again but the canister soon runs out.)
Plan: A: the parallel earth; Q: What is doomed? A: the Doctor; Q: Who asks his friends to help him return to his own world? A: his friends' counterparts; Q: Who does the Doctor ask to help him return to his own world? A: the Brigade Leader; Q: Who only sees the TARDIS as a means of escape? Summary: With the parallel earth doomed, the Doctor asks his friends' counterparts to help him return to his own world but the Brigade Leader only sees the TARDIS as a means of escape.