Angel Bob

Before the crash
A fully powered lone Weeping Angel had been recovered from a dead planet in a "dormant" cycle. It passed from private hand to private hand and through an unknown series of events, finally came into the hands of the captain of the Byzantium (ship).

The Weeping Angel was put inside the Byzantium's vault. River Song, after being sent to assess the situation, recognised it as a Weeping Angel and, after warning the captain the ship was going to crash, escaped with the help of the Eleventh Doctor and Amy Pond.

The Byzantium crashed inside an Aplan temple on Alfava Metraxis, who's species were wiped out by an unknown catastrophe in the mid 47th century. The Angel was the only survivor of the crash.

The Angel on the screen
A four second recording of the Angel was played on a monitor inside a surveillance chamber that was put inside the Aplan Temple. River Song showed the Doctor, Amy and Father Octavian four seconds of the footage. Amy stayed inside the surveillance chamber whilst the Doctor and River went outside to look at some research and Octavian left to prepare the detonation to get into the Maze of the Dead. Amy was sealed inside and the door deadlocked. The Angel on screen began to move, even though it was only a recording. Meanwhile, the Doctor and River discovered that an image of an Angel will eventually become one. The Angel on screen inside the chamber began to come out the screen. The Angel was stopped by Amy turning the monitor off at the end of the four second loop.

In the catacombs
The Angel escaped the vault of the Byzantium and went through the Maze of the Dead. Clerics Christian and Angelo were sent to investigate the further catacombs and had their necks snapped by the Weeping Angel. Cleric Bob was lured into the catacombs by the Weeping Angel projecting the voice of Cleric Angelo. It later used Cleric Bob's voice as a mouthpiece to communicate with the Doctor, trying to anger him by claiming the Doctor's encouragement to Bob was in vain, and how it enjoyed killing him. The Angel then said it was coming to get the Doctor, Amy, River, Octavian and the remaining Clerics.