Tales from the Resistance: Back to the 2nd Dimension, Doof 101

After Doofenshmirtz is defeated, a new threat in the 2nd Dimension emerges, leaving it up to Phineas, Ferb, Candace and her resistance fighters to defeat this new foe.
After facing the choice of imprisonment or community service, Doof becomes a teacher at Vanessa's school. Meanwhile, a trio of bugs embark on a journey to become the first insects to communicate with humans.