The intro scene. Onaga, the Dragon King, comes barging in on Quan Chi, Shang Tsung, and Raiden, after the former two took out the latter and Quan bitchslapped Shang afterwards. He takes a full-on assault from the three without flinching, prompting Raiden to self-destruct in a last-ditch effort to take him down. When the dust settles, there is Onaga, completely unscathed, holding Shinnok's amulet.
In Ermac's ending, he single-handedly takes on Johnny Cage, Sonya, Jax, Kitana, and Kung Lao with no trouble at all. Even better? It turns out to be canon.
Sub-Zero's ending, where he basically goes One-Man Army on a horde of Tarkatans.