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| english = Friend or Fiend
| kanji = 十代VS暗黒界の斥候スカー
| romaji = Jūdai Vāsasu Ankokukai no Sekkō Sukā | japanese translated = Judai vs. VS Scarr, Scout of Dark World
| episode number = 133
| japanese air date = April 25, 2007
}}
'''"Friend or Fiend"''', known as '''"Judai vs. VS Scarr, Scout of Dark World"''' in the Japanese version, is the one hundred and thirty-third episode of the ''[[Yu-Gi-Oh! GX]]'' anime. It first aired in Japan on April 25, 2007 and in the US on December 27, 2007.
{{episode summary|To protect a [[Kyle|small boy]], [[Jaden Yuki|Jaden]] [[Duel]]s [[Scarr, Scout of Dark World (character)|Scarr]] and learns more about the state of [[Duel Monsters Spirit World|the world]] that they've entered in the process.}}
