Doctor

A native of the planet Gallifrey, part of the race known as the Time Lords. The Doctor attended the academy with the Master and several others. As with his fellow students, the Doctor shunned the accepted teachings of his race, preferring to become a lone traveller.
The Doctor shares many of the physical traits that the Master has displayed although he is more restrained in using some of those more questionable abilities.
The Doctor's appearance on Earth was purely accidental, despite being aware of Zordon and the Power Rangers of other planets. The Doctor's primary aim is the repair of his TARDIS.