Y'know Sonya Blade's MKX Ending?
"Exhausted by her ordeals, Sonya slipped into a deep sleep and began to dream. Kano held Jax and Cassie hostage. He made Sonya choose who would live and who would die. Seeing no way to free them both, she chose Cassie-and screamed as Kano killed Jax before her eyes. Still screaming, she was awoken by Johnny. He had horrific news. Jax was dead by an assassin's bullet."
Now i have a theory, i believe that Sonya's Dream was caused by Freddy Krueger, so let's say Freddy does exist in the Mortal Kombat Series.