The Doctor uses the Host to reach the bridge, where he uses the heat from entry into the Earth's atmosphere to restart the ship's engines (which helps prevent the ship from crashing into Buckingham Palace). After stabilising the ship, the Doctor realises that the teleport bracelet Astrid was wearing backed up her molecular pattern. However, the damaged system can only partially regenerate Astrid. The Doctor reluctantly allows her to dissipate into atoms, so she can fulfil her dream of exploring the universe.