After picking up Adam at the end of 'Dalek', the TARDIS gets knocked off course by a temporal tsunami and ends up in a cinema in Birmingham 2012. Here there are time anomalies that the Doctor can't help but investigate, sending him back to the same spot in 1892. Rose soon follows with the next anomaly, but winds up in 1922 (it appears these anomalies jump 30 years forward each time until they reach the present of 2012). Thanks to Rose's phone the Doctor is able to communicate and reach Rose, then together they can talk to Adam. Unfortunately a sinister threat known as the bygone horde are riding these temporal anomalies. The Doctor is able to talk Adam through how to bring himself and Rose back to the present and defeat the bygone horde.

This is a more fun adventure than the previous 2 installments in this series. The idea of giving Adam a story to be useful, maybe even heroic is a nice one. But if I'm being honest, I still find Adam to be pretty uninteresting. The 9th Doctor is the standout character here. He feels more like 9 here than he did in the rest of this series (thus far) and gets some fun banter with his companions.

The bygone horde are a reasonably creepy villain, and it is an interesting concept. A collection of people who were killed in the Time War and are kept alive (in whatever capacity they currently live) and bonded together through memory. They plan to ride these temporal distortions through to the present where they'll essentially just take over the world (possibly through possessing humanity, which they can do. Honestly I wasn't entirely clear on their plan. This could be my fault and I missed it being explained though). The issue is that this feels very similar to Gelth from the 'Unquiet Dead', who were also a ghostly horde of beings, displaced by the Time War and are able to possess people. Both are also planning to use temporal distortions to come through to Earth where they will take over the planet. So the 9th Doctor has already faced a similar threat and I liked this version less.

The temporal tsunami and time jumping were fun though. So all in all a pretty good story, but nothing special.