Time Lord messenger (Genesis of the Daleks)

After a transmat beam used by the Fourth Doctor and his companions was redirected to Skaro, a Time Lord messenger visited the Doctor.

He explained to the Doctor that the Time Lords had forseen a time when the Daleks would dominate the universe and gave him a mission to disrupt the Daleks' timeline by preventing their creation, making them less aggressive, or identifying an inherent weakness. He also gave the Doctor a time ring to leave Skaro once the mission was complete. Then he vanished. (TV: Genesis of the Daleks, PROSE: Doctor Who and the Genesis of the Daleks)

Identity
Various conflicting accounts existed regarding the messenger's identity. (PROSE: The Dalek Problem, Lungbarrow, Divided Loyalties, AUDIO: Ascension)

By one account, this messenger was Deliavatsud, a director of the Celestial Intervention Agency who went rogue in an attempt to subvert the APC Net's predictions of total Dalek domination. He was subsequently tried for unauthorised intervention and executed by disintegration. (PROSE: The Dalek Problem)

By another account, the messenger was Ferain, the Director of Allegiance for the Celestial Intervention Agency and author of An Alternative History of Skaro: The Daleks without Davros. When Ferain arrested Leela, the Seventh Doctor recognised him from the trenches on Skaro. (PROSE: Lungbarrow)

According to one other account, the leader of the team who identified the Daleks' threat to the universe and developed a plan to stop them was named Jelpax. (PROSE: Divided Loyalties)

By yet another account, this messenger was Valyes, who was sent in disguise by Narvin after the Daleks invaded Gallifrey. (AUDIO: Ascension)