Rose asks the Doctor to take her back to the point in time when her father was killed by a hit and run driver. However, the Doctor finds Rose had an ulterior motive, when she instead saves her father from being killed.
The Doctor is livid, and decides to leave Rose there, and continue on his journeys. But, the change in the time line has unleashed terrifying forces, which chase the Doctor, Rose, her father and a wedding party into a church. The Doctor must find a way to deal with these strange creatures, but in the end it is up to Rose's father to defeat the horrifying entities.