. . "Key of Rassilon"@en . . . . "The First Doctor once had a similar key to the Matrix. It was collected by Graak on a mission from the Master to free one of the Doctors' incarnations. (GAME: Destiny of the Doctors) File:StubTab.png"@en . . . "Key"@en . "Key of Rassilon"@en . "The First Doctor once had a similar key to the Matrix. It was collected by Graak on a mission from the Master to free one of the Doctors' incarnations. (GAME: Destiny of the Doctors) File:StubTab.png"@en . . . . . . . . .