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High Evolutionary

From TARDIS Index File, the free Doctor Who reference.

The High Evolutionaries are powerful entities attuned to the cosmos. They reside either within the Matrix or can be contacted there. They possess a council, who will sometimes take action against great cataclysms.

Members include:

The Doctor first contacted them when the demon Melancius broke free and caused time distortions. The Evolutionaries informed him of the threat. (DWM: The Tides of Time)

The Evolutionaries would hire the Threshold to try and prevent the Daleks from invading parallel universes. (DWM: Fire and Brimstone, Wormwood)

The Doctor's mind would be summoned to them when he was hospitalised on Gallifrey. They warned him of a vision of Gallifrey turned into a violent empire. By this point, Merlin had been replaced by Demoiselle Drin of the Order of the Black Sun. (DWM: The Final Chapter)

Paul Cornell's comic Captain Britain And MI:13 mentioned in #2 that "the Higher Evolutionaries of all the worlds" have imprisoned Merlin in a realm of dark magic; Merlin here was shown to be the Doctor Who Magazine Merlin, already established by Marvel Comics to be a guise of their Merlin.