Prophecy

During the course of Doctor Who, many prophecies have been made by those with physcic abilities.

Evelina and Lucius Petrus Dextrus

During their time in Pompeii, the Doctor and Donna end up encountering Evelina and Lucius Petrus Dextrus who both posses telepathic abilities as a result of the Pyrovillies and as a result of a crack in time opened by Vesuvius' eruption, posses the ability to see into the future. As a result, they make some startling prophecies about the Doctor and Donna's futures and pasts.

Evelina

• Evelina is able to tell that the Doctor and Donna aren't who they say they are and that the Doctor's name is Doctor and not Spartacus as he tells him and that Donna calls herself Noble (her last name). She is also able to tell that both came from far away.
• Evelina also predicts that the Doctor's name is false and that his true name is hidden in the Cascade of Medusa herself.
• Evelina is also able to predict the Doctor's true nature.

Lucius

• When pressed, Lucius is able to tell that the Doctor is from Gallifrey and Donna from London.
• Another prediction of his is to the Doctor: "she is returning" something that is unclear at the time.
• He predicts that Donna has "something on her back" which startles her, but is something not understood at the time.

Fulfillment

• Evelina's prediction about the Doctor's name is likely about the Medusa Cascade and how there Davros named the Doctor the "Destroyer of Worlds."
• Lucius's prediction about she is returning refers to Rose Tyler's return, which is something that is happening throughout series 4 but is unclear until Turn Left.
• Lucius' prediction that she has something on her back comes true in Turn Left: a Time Beetle attaches itself to her back and she ends up with many people pointing that out to her alternate self until she gets rid of it by changing time with Rose Tyler's help.