Killer of killers

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Across
  1. 2. what planet is John Torres from?
  2. 4. warrior from Japan
  3. 6. this alien is the killer of...
Down
  1. 1. The dangerous alien that hunts people
  2. 3. what vehicle does John T. drive?
  3. 5. name of the viking warrior
  4. 6. what weapon does the samurai use?