Final Act: The Last Prophecy is the episode 56 and final episode of Shinkenger. This story was Samuel used reckless the power of his Beast as SpaceGodzilla tell Nevel to don't tell everyone to betray Samuel.
With the Shinkengers and everyone was disappeared, Samuel appeared but apparently filled with suffering anger at Sadako. Samuel tell Takeru and the others leave then transformed into ShinkenRed, but enchance into ShinkenRed Beast Mode. Samuel manage to defeat Sadako then seal her into Nothing World by his Shinkenmaru.