Sith Ferb vs. Phineas

As Ferb is about to defeat Phineas, Isabella arrives and shoots Ferb, saving Phineas. She reveals she couldn't leave him in danger, despite being a rebel.

Phineas and Ferb encounter a 'Sithonator,' which Ferb modifies to create an army of Sith warriors. Ferb, now under the influence of the dark side, attempts to recruit Phineas.

Phineas attempts to reason with Ferb, but Ferb insists on destroying him if he won't join the dark side. Phineas reluctantly prepares for a lightsaber battle against his brother.

During the duel, Phineas realizes that Ferb has modified his lightsaber and decides to make his own modifications, creating a multi-bladed lightsaber to counter Ferb's power.

After Subduing Ferb, Phineas and Isabella try to find a ship to escape the battle station. They find Perry the Platypus, who helps them locate a bus. They are later joined by Candace, Phineas’s long-lost sister.

Isabella returns to pick up Phineas, Ferb, and Candace in her ship, narrowly escaping the destruction of the battle station. The Firestar Girls had already evacuated the innocent civilians.

HP reports on the destruction of the Death Star and acknowledges the presence of other Death Star plans. Meanwhile, Perry the Platypus escapes in a platypus-sized escape pod, only to realize he forgot his keys.