Santiago Jones

Santiago Jones was Jo Grant's grandson.

Biography
He travelled the world with his parents, protesting for ecological rights. When the Doctor was declared dead, he was taken to the UNIT base and met aliens, including the Shansheeth and Groske, for the first time. He quickly made friends with Rani and Clyde and witnessed the Doctor using Clyde's residual Artron energy to break through to Earth. (SJA: Death of the Doctor)