New Venice

New Venice was a planet which Doom was required to kill a target at Duke Derek Gamma's Masked Ball. (PROSE: Hour One) Unbeknownst to her, the target was her past self. (PROSE: Out of Time) The First Doctor was present and warned Doom that she was making a mistake but she went through with it anyway. The hit went horribly wrong which unleashed a Gatherer on her. (PROSE: Hour One)

Doom later inquired about the event to the Ninth Doctor but he couldn't tell her anything. (PROSE: Extraction Point)

On the final hour of her life, Doom accepted a hit on New Venice once again as spurred onto her by the Eighth Doctor. (AUDIO: The Crowd) She arrived at the same ballroom, only to find it charred and ruined. She was reunited with the First Doctor who found himself unable to leave due to the temporal anomaly. They undo the anomaly by sending Doom back to the original event in which she'd shoot herself in the arm causing her to miss and set a curtain of fire, causing the destruction of the ballroom. With the anomaly undone, the Gatherer lost interest in Doom and took Terri instead. (PROSE: Out of Time)