Telepathy is an ability that allows a being to read the mind of another being. Certain hok'tar have shown telepathy, but this often requires genetic advancement or prolonged evolution.
History[]
Eggar was given telepathic abilities by Nirrti, as was Khalek by Anubis. (SG1: "Metamorphosis", "Prototype")
Adria, the leader of the Ori or "Orici" displayed this ability many times. (SG1: "The Shroud")
The Wraith also possess telepathy. They can only directly read the minds of their own species, but they can influence Humans. (SGA: "Rising", "The Gift")
When affected by a Ascension machine, Meredith Rodney McKay was able to read the current thoughts of people around him which led to an awkward moment between himself and Dr. Rafaela Esposito. (SGA: "Tao of Rodney")
Alternate realities[]
Todd from an alternate reality was able to get into John Sheppard's mind and even got his name. (SGA: "Vegas")