The Ninja Killer is a feature of the Ninja Warrior series. It is a replay camera of past competitors.

Usually near the middle of an episode, the Ninja Killer replays the past victims who have fallen subject to the muddy waters... it then focuses on one particular obstacle, usually the one wit the most kills, and replays the failures of the obstacle. A lot of them are humorous defeats, and the obstacle that claims them is usually credited.

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