Santiago was named for Santiago, Chile, where he was born in a caravan at the foothills of the Andes Mountains. He travelled the world with his parents, protesting for environmental and political causes. However, he felt estranged. His family was scattered all over the world for months at a time because of their lifestyle. When the Doctor, whom he had always wanted to meet, was declared dead, Santiago was taken to the UNIT base. There, he met aliens, including the Shansheeth and Groske, for the first time. He quickly made friends with Rani and Clyde and witnessed a plot by the Shansheeth and Colonel Tia Karim to steal the Eleventh Doctor's TARDIS by making a key from the memories of his grandmother and Sarah Jane Smith. Santiago was advised to make some changes in his relationship with his