Reign of Isabella

'Reign of Isabella' is the second-to-last episode of the fourth season of Phineas and Ferb. It is the second part of the epic 'Dark Isabella' saga.

Plot
Dark Isabella has become a threat to world security. A special operations team infiltrates Danville in a search for Phineas and Ferb. After they are found, they employ the stepbrothers to create a weapon that will neutralize Dark Isabella. They successfully create it: a huge laser in space that will drain all the evil from Dark Isabella. Without the government's knowledge, Phineas and Ferb fly away to Dark Isabella's current location, South America.

In South America, Dark Isabella is destroying the rainforest with her evil powers. When she sees Phineas, she tries to convince him into becoming her consort. Phineas refuses, and Dark Isabella vaporizes him. Ferb, watching from a distance, vows to avenge his brother.

The 'Too Young' Line
Special Agent: Aren't you a little young to have created a crazy supervillainess?

Phineas: MAY-bee.

Ferb's Lines
Ferb: Oh damn.