After conquering Shinnok, you'll need to defeat his alter ego as well. The only move that you have that can hurt the second incarnation of Shinnok is the polar blast. Recharge with an urn and repeat the whole thing until he's dead. It'll take five hits to kill him off, so you'll need at least four urns.
After you beat him, exit through the portal and after the credits you will get to see the extra movies.
Password Effect ZCCHRY Reveal codes RCKMND View an exploding Earth boss CRVDTS Display credits GTTBHR Infinite lives NXCVSZ Start with extra urns
Level Password 2 THWMSB 3 CNSZDG 4 ZVRKDM 5 JYPPHD 6 RGTKCS 7 QFTLWN 8 XJKNZT