SPOILER ALERT!
There is a LVL80TSM a.k.a. Tauren Space Marine Easter Egg in the Zero Hour mission in StarCraft II: Wings of Liberty singleplayer campaign.
This is the map for the location - http://strangera.files.wordpress.com/2010/07/starcraft-2-tauren-marine-easter-egg.jpg
More info [BG Language] at http://strangera.com/2010/07/28/starcraft-2-tauren-marine-easter-egg/
Thanks to X fro the tip.