Captain J.J. Screwnut, Mr. Hootahman and Woowoo Triangle are from terrestrial-mass planet orbiting the pulsar PSR B1257+12.
Little is known about these bearded creatures. They have a hard protective outer layer on their heads which looks like a translucent shell. It is a vitally important evolutionary attachment to the brain. The telepaths are among the most honest living organisms in the galaxy, because all thoughts and mental processes in these shells are visible to others anyway. It means that the telepaths are not real telepaths, but nobody cares.