General Blue Saga #51 : Beware of Robot Bulma, Goku, and Krillin discover a secret underwater port at the heart of the Pirate Cave. And though the pirates are long gone, this port is far from abandoned! A ferocious sword-wielding robot lurks in the shadows, programmed to guard the pirates' treasure. And this metal monster isn't taking any prisoners! Episode List 46 . Bulma's Bad Day 47 . Kame House - Found! 48 . Deep Blue Sea 49 . Roshi Surprise 50 . The Trap is Sprung 51 . Beware of Robot 52 . The Pirate Treasure 53 . Blue, Black, and Blue 54 . Escape From Pirate Cave 55 . Penguin Village 56 . Strange Visitor 57 . Arale vs.Blue