This is part of a series of reviews of Doctor Who in chronological timeline order.

Previous Story: Escape from Holy Island

This is a difficult story to review because it's essentially part one of a two parter, but I'll give it a go anyway. It's nice to have Flip and Constance, although it's a bit disappointing that they're seperated for most of it. The Sontarans are a bit nothing here, I can't say I cared very much for their presence. The titular sibling rivalry between two of the quins was quite fun though.

Next Story: Children of the Revolution