High Quality Content by WIKIPEDIA articles! Bulk and Skull are fictional characters in the Power Rangers universe. They appeared as permanent cast members from Mighty Morphin Power Rangers until Power Rangers in Space. Bulk (by himself) was a recurring character in Power Rangers Lost Galaxy and Skull made a cameo appearance in the first episode, making the pair the two longest consecutively appearing characters in the program. They later returned for a Power Rangers Wild Force cameo and in Power Rangers Samurai, where Bulk is teaching Skull`s son Spike.