The Doctor discovers that the Slitheen are looting Earth for financial gain rather than invading it. In order to destroy a fictitious ship that is allegedly hovering over London, the Slitheen demand that the UN disclose the nuclear activation code, claiming that there is a threat to global security. The Slitheen say that they will sell the irradiated remnants of Earth as inexpensive spaceship fuel in response to the Doctor’s prediction that they will fire at other nations and create World War III. In the meantime, another Slitheen breaks into Mickey’s apartment and destroys it with vinegar and acetic acid. In order to eliminate the Slitheen assembled at 10 Downing Street, the Doctor assists Mickey in firing a non-nuclear missile at the building. The Doctor, Rose, and MP Harriet Jones manage to hide in a reinforced room and survive. Meanwhile, the Doctor has earned Jackie’s trust and she allows Rose to continue travelling with him whilst he offers Mickey an opportunity to join the two on the TARDIS, but he turns it down.