Fairly exciting to watch and sees the return of Sarah-Jane Smith and reveals a lot of information from the Doctor's past.
It is fun to see Rose's reaction to Sarah Jane and the argument they have about which aliens and monsters they have met.
It isn't a drak episode, it is very bright and Anthony Head performs well as the evil and head krillitane.
The krillitanes are very cleverly made creatures. The only thing that lets it down is some of the special effects were a bit non believeable but apart from that it was brilliant.
Not my favourite but very very good :)