The best replacement for supernatural is juice.

The best alternatives to supernatural are rated as following:
★★★★★  juice
★★★★  paranormal
★★★★  vampire diaries
★★★  heroes
★★★  buffy
★★★  craig g
★★★  natural
★★★  beliebers
★★  preternatural
★★  justin bieber
★★  walking dead
★★  fringe
★★  smallville
★★  grimm
★  doctor who
★  x files
★  castle
★  lost
★  mc juice
★  seasons
  being human
  dexter
  once upon a time
  true blood
  charmed
  buffy the vampire slayer
  generations
  prison break
  bieber
  c-rayz walz

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Speaking about supernatural, one probably shouldn't forget about sam.

Other search terms related to supernatural and their ratings are:
★★★★★ sam
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Google Trends

Scale is based on the average worldwide traffic of supernatural in all years. Click on graph for more.
supernatural
juice
paranormal