The Sickness

The Sickness is the 55th episode of Season 31 on Disney and the 69th on Nickelodeon. Doofenshmirtz creates a deadly virus that spreads all over town. Phineas and Ferb are determined to find a cure. This is also the last Season 31 episode to feature a silly song break.

Episode Summary
One day, Doofenshmirtz was researching health related issues when he came across a blueprint for a Sick-Inator. Doofenshmirtz thought this would be a good way to weaken the town and Perry. He ordered the blueprint and began to work.

No one knew about what was about to happen in the town.

to be continued