Board Thread:Mortal Kombat Wiki/@comment-24521551-20181211152953

"Long ago, Shao Kahn once served as an adviser to Onaga when the latter ruled Outworld as the Dragon King. Onaga's Empire had become the most powerful among all of the realms, and so he began searching for a way to become immortal. Before this goal could be realized, Shao Kahn made his move by poisoning Onaga and taking his kingdom. Upon assuming the Emperor's Throne, Shao Khan began to drain the vegetation energies of Outworld and turned it into a barren wasteland. From then on, Shao Kahn continued many of the former emperor's plans to conquer all. He continued to add lesser realms to Outworld, either through direct conquest or through Mortal Kombat."

I think I'm missing on this, because I haven't heard of this happening in the OG timeline or my memory is just fuzzy.

My question is, where and when did this happen? Which game specifically? 