Vice Admiral Aaron: Starfleet Admiral, based in Sol Sector. In 2364 fell prey to an invasive species of parasites that took control of his body. The full extent of his actions during that time may not be known as the parasites covered their tracks very well and those infected did not retain memory of what had transpired. Aaron was at Starfleet Headquarters when the Enterprise returned after the destruction of the Horatio led credence to the late Captain Keel’s theories of an alien takeover of Starfleet. Invited Picard to dinner at Headquarters and along with Admiral Savar, Captain Scott, they revealed their true nature to him. They believed Riker, who joined impromptu, had also been turned, but it had been a ruse (helped with a bit of medical modifications), and Riker and Picard took down the turned attendees, including Admiral Aaron. The creature left Aaron when he was neutralized.

Appeared in Star Trek TNG’s “Conspiracy”