Textra

Textra was a Metamorphan male. He, along with the rest of his species, was tranformed into an energy being after a meteorite struck his homeworld Metamorpha. Centuries later, in 2266, he and other Metamorphans made mental contact with Spock of the USS Enterprise (NCC-1701) and influenced him to construct a device to reverse the meteorite's effects on the planet, which also returned them to their original state. However, Textra decided to stay in Spock's mind, seeking escape, knowledge, and adventure. Spock refused to allow this to happen, but Textra prevented him from informing the others of his presence. Spock instead used the transporter to destabilize his body, leaving Textra with nothing to possess.