First Sensorite

The First Sensorite was one of two Sensorite Warriors who boarded Maitland's ship.

Biography
After some tense moments, the two Sensorites negotiated with the First Doctor that he, Susan, Ian, Carol and John would accompany one Warrior to the Sense Sphere, while the other Warrior would remain on the ship with Maitland and Barbara. (TV: The Sensorites)