(To Jack). A second chance. And he holds up the paper and shows them the headline: New Mayor, New Cardiff, complete with a picture of Margaret as she objected to the photographer taking her picture. Cardiff. He and Jack glance at one another. He squints at the model of the nuclear power station. IDRIS: Yes, she is. It was an accident. MARGARET (CONT'D) : To lock onto the nearest alien power source and open the rift. MARGARET: What rift would that be? Margaret the Slitheen can live her life again! Mickey has no answer to this. Over there. TARDIS
Darkness has now fallen, and they have taken Margaret back to the TARDIS. THE DOCTOR: Regressed to her childhood. THE DOCTOR: She looked into the heart of the TARDIS, and even I don't know how strong that is. THE DOCTOR: She's an egg. THE DOCTOR: The rift was healed back in 1869...
ROSE: Thanks to a girl named Gwyneth, 'cos these creatures called the Gelth, they were using the rift as a gateway but she saved the world and closed it. There used to be a real Margaret Blaine. We need to refuel.
Plan: A: The Doctor; Q: Who sees that Margaret has created a nuclear power plant? A: Jack; Q: Who sees the opportunity to use Margaret's extrapolator to speed up recharging the TARDIS? A: Cardiff; Q: Where do the Doctor, Rose, and Jack visit to refuel the TARDIS? A: Mickey; Q: Who meets the Doctor, Rose, and Jack in Cardiff? A: Slitheen; Q: What is the name of the alien race that Margaret Blaine is a part of? A: Margaret Blaine; Q: Who is the Slitheen impersonating? A: a nuclear power plant; Q: What did Margaret Blaine create? A: a device; Q: What did Margaret use to flee? A: her home planet; Q: Where does Margaret not want to be taken? A: a criminal; Q: What is Margaret considered on her home planet? A: several failed attempts; Q: What did Margaret do to try to kill the Doctor? A: an earthquake; Q: What strikes Cardiff? A: second; Q: What chance at life does Margaret get? A: an egg; Q: What does Margaret turn into? Summary: The Doctor, Rose, and Jack visit Cardiff to refuel the TARDIS at the rift, and Mickey meets them there. They discover that the Slitheen impersonating Margaret Blaine is now the mayor of Cardiff, and they capture her, suspicious of what she has done. The Doctor sees that she has created a nuclear power plant designed to open the rift and destroy Earth, and a device she would use to flee. Margaret objects to being taken back to her home planet, as she is considered a criminal there. After several failed attempts in killing the Doctor, Margaret requests to be taken to another planet. Jack sees the opportunity to use Margaret's extrapolator to speed up recharging the TARDIS, but this proves to be a trap as it was meant to send the nearest alien power source to the rift. As an earthquake strikes Cardiff, Margaret looks into the heart of the TARDIS, which gives her a second chance at life, restoring her back into an egg.