Right after the Eleventh Doctor's son died, the Tenth Doctor helped him into the TARDIS before he became the Twelfth Doctor. His last words were "I know you did." Then, he regenerated. (The Palace of Death) "C'mon," is the Twelfth Doctor's new "Geronimo!" The Doctor got upset when he discovered he was American. (The Odd Carnival) He met Lilly Smith and they battled the Cybermen at an underground carnival. There was a king-like Cyberman called the Silver One who planned to take over America. The Cybermen also had cloaks to blend in around the carnival. (The Odd Carnival)