Ī special breed of spore from the planet Vygoire was able to mind control and telepathically link those infected by it. The Voice in the Darkness is also able to control terrans and protoss, effectively 'possessing' them. The indoctrination visor was designed to amplify these talents among terrans who posess the ability. Mind control is considered to be one of the most highly sought after abilities among Terran Dominion ghost recruits.
Sarah Kerrigan had mind control powers as well, and used these abilities to enslave Matriarch Raszagal. Dark archons however, through an immense expenditure of energy, are able to project a portion of their psychic essence into another being, gaining control over its actions and access to its memories.
Judicators could use their powers to subtly influence the minds of other creatures.
