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i don't know witch card pack it is in but i did a quick search and found it on eBay for later viewers bear in mind this was posted in the year 2012.
The possessive form of the plural noun viewers is viewers'.
example: The viewers' reactions were very positive.
I apologise to viewers for the language used.The viewers were shocked at the live confession.
The suffix for "viewers" is "-ers."
Yes, "viewers" is the simple subject in the sentence "The viewers looked into a special machine." It is the noun that the sentence is about.