Power Rangers Unlimited #4

It's a race across a barren wasteland to stop a mysterious Zord no one has witnessed before! The world of the Lightspeed Rangers has been destroyed, and the Aquabase lies in ruin, leaving Joel Rawlings, Lightspeed Green, as the only Ranger left. Worse yet, the planet is faced with a dystopian future where water is worth more than gold, forever shifting the balance between good and evil. Now the race is on, and the clock is ticking as the elite Unlimited Team, led by Trini Kwan, joins forces with the enigmatic Aqua Boss to build a mystical weapon. Can they stop their enemy-and possibly turn back the clock on Joel's world to a time before it became so desolate?