Last of the Fletchers

'Last of the Fletchers' is the last episode of the fourth season of Phineas and Ferb. It the finale of the 'Dark Isabella saga.'

Plot
Following the events of the previous episode, Dark Isabella has completely taken over the planet Earth. Most of the monuments have been rearranged to feature her image, and no one can even think about rising up. However, Ferb is travelling across the planet, and finally arrives in the ruins of Danville. He meets Baljeet, whom he and Phineas had entrusted with the formula that created Dark Isabella. Ferb is able to reverse the formula and create an anti-Isabella formula. He then sneaks in to the water bottling plant where Dark Isabella gets all her water. He then poisons the water with the anti-Isabella formula, and watches as it is shipped off to Dark Isabella's palace. Then he discovers one of his old inventions, the time machine. Deciding that there is only one thing to do, he goes back into the past and alters the formula so that Isabella will not gain immense power. After that, he ceases to exist, but a better timeline emerges.

The 'Too Young' Line
Baljeet: Aren't you a little young to be saving humanity?

Ferb: Indeed.

Ferb's Lines
In this episode, Ferb speaks normally.