Zordon is the Power Rangers' mentor.  He is an interdimensional being caught in a time warp appearing as a ghostly head in a giant tube.  He is important to the story but is a minor role.  He only appears at the beginning of the story to send the rangers on their mission and at the end to return the Justice League to their earth.  His voice should be deep and almost announcer-like.  If possible an impression of David Fielding's depiction of the character would be excellent.