An exciting, action-packed opener to the third Dalek Universe box set. This time, the Tenth Doctor and Anya Kingdom find themselves inside the Dalek and Movellan war.

The River Song mystery regards whether she's a Movellan or the real deal is interesting, especially considering the human/Movellan hybrid Kamen who refers to her as his 'mother'. It does seem judging by the end of this story, that The First Son is the one and only time River features in the box set, which is surprising given her prominence on the cover art.