Doof gets replaced

This is basically episode 1 of Phineas, Ferb, Pinky and the Brain.

Plot
The episode starts at Doofensmirtz Evil Incorporated, where Doofensmirtz is planning to take over the Tri-State area with an earthquake. However, Mimi Mimikins comes in and says "I'm sorry. Doofensmirtz Evil Incorporated is to close." Doofensmirtz then says, "What?" Mimi replies with, "I, owner of ACME labs, have taken over YOUR job to take over the Tri-state Area." Doof ends the scene with, "Curse you Perry the Plata-I mean-Curse you Mimi the Mimikins!" Then, we cut to Phineas and Ferb's home. Isabella Garcia-Shapiro is trying to make a rainbow machine, when Pinky and the Brain make it into a black hole machine. Without noticing, Isabella turns on the machine. A black hole forms, scaring her.

To be continued