In "The Night of the Doctor" (2013), it is shown that the Eighth Doctor regenerates into the War Doctor to fight in the Time War. Many years later, as shown during "The Day of the Doctor" (2013) and also described by the Partisan in "The End of Time", the War Doctor originally planned to use a Time Lord weapon known as the Moment to destroy the Time Lords and Daleks. However, after being shown the Tenth and Eleventh Doctors during "The Day of the Doctor", he works together with them to change the assumed outcome of the Time War: thirteen incarnations of the Doctor team up together to freeze Gallifrey in time and place it outside of their universe (protecting it and the remaining Time Lords), while the Daleks destroy themselves in their own crossfire once Gallifrey is gone. The War Doctor does not retain the memory of these events and the Doctor spends centuries believing he burnt Gallifrey until the Eleventh Doctor's time; this is because the time streams are out of sync after the War Doctor meets his future selves and the altered events are only known to the Doctor once they occur in the Eleventh Doctor's experience and become part of his memory. Indeed, earlier on in the episode, both the Tenth and the Eleventh Doctors mistakenly believe that the War Doctor killed all of the Time Lords on the last day of the Time War. After being informed that the plan to save Gallifrey was successful, the Eleventh Doctor sets out to find Gallifrey and restore the Time Lords.