Basically every week there will be a poll between six of the current released+Deathwing, this will not include all the raid bosses, but many of the lore important or most difficult ones.
Note: I'm not adding Sargeras because he would win this by a landslide.
Special note for this showdown only - There will be two winners so we wont have an uneven number of contestants next round. This also means you are allowed to have two votes for the first and second place winners.
Boss Setup - Round 1
Showdown 1 Winner - C'thun!
Showdown 2 Winner - Twin Emperors
Showdown 3 Winner - Algalon
Showdown 4 Winner - Malygos
Showdown 5 Winner - Sindagrosa
Showdown 6 Winner - Yogg-Saron
Deathwing vs. Illidan Stormrage vs. Mu'ru vs. Kil'Jedean (While coming out of sunwell not full power) vs. Chromaggus vs. Majordomo Executus
Winners Round 1 - C'thun, Twin Emperors, Algalon, Malygos, Sindagrosa, Yogg-Saron,