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Dragon Ball GT Episode 50
The Five-Star Dragon
During Goku and Pan’s continuing quest for the dragon balls, they stumble upon an abandoned city. They are warned away by a couple that blames the mass exodus on a slime that absorbs electricity. After resolving to stay and complete their task, they find Rage Shenron, the 5-star dragon! And they quickly realize that this electric slime has a bigger and much deadlier purpose!