The best replacement for walking dead is breaking bad.

The best alternatives to walking dead are rated as following:
★★★★★  breaking bad
★★★★  game of thrones
★★★  lost
★★★  american horror story
★★★  toy story
★★  wolf among us
★★  last of us
★★  comic
★★  oscars
★★  dexter
★  atlanta snow
★  olympics
★  atlanta
★  28 days later
★  cosmos
★  resident evil
★  sons of anarchy
★  prison break
★  game of thrones ratings
★  duck dynasty
  oscars ratings
  true blood
  house of cards
  comic book
  breaking bad ratings
  supernatural
  true detective
  grammys
  crossed
  atlanta snow 2014
  falling skies

Your alternative for walking dead is not listed? Suggest!
Speaking about walking dead, one probably shouldn't forget about shane.

Other search terms related to walking dead and their ratings are:
★★★★★ shane
★★ zombies
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walking dead
breaking bad
game of thrones