Evelyn took Hex in as her ward for several months and told him about his mother , Cassie .
A few years later , Hex was dropped off on Pelicham after the Seventh Doctor died fighting a pan-dimensional enemy called Nobody No - One .
Evelyn took Hex in as her ward for several months and told Seventh Doctor about Seventh Doctor 's mother , Cassie .
A few years later , Hex was dropped off on Pelicham after the Seventh Doctor died fighting a pan-dimensional enemy called Nobody No - One .