Destro overthrows Cobra Commander and tries to force the world to surrender, but Scarlett leads Cobra's slaves in a revolt from inside Cobra Temple while Duke and the rest of the Joes attack from the outside.
Did You Know?
Scarlett had been kidnapped by Destro at the end of part 4 and was taken to Cobra Temple. But when the Joes are around their MASS device in part 5 getting ready to fire it in attempt to stop Cobra's beam, in a wide overhead shot from slightly behind everyone, Scarlett is seen standing there with the Joes with her back to the screen. But since she is still a captive, she shouldn't be there. See more
[upon seeing the Cobra Temple for the very first time
It looks like the Hotel Dracula!