The 2nd Dimension is a alternate universe where Danville were ruled by Heinz Doofenshmirtz-2. There was a group known as the Resistance that was founded and led by Candace Flynn-2. The 1st Dimension people (Phineas-1, Ferb-1, Heinz Doofenshmirtz-1, Perry-1, and Candace-1) visited the 2nd Dimension and were determined to help the Resistance stop Heinz Doofenshmirtz-2 and save the 2nd Dimension. Heinz Doofenshmirtz-2 is now defeated and everyone in Danville of the 2nd Dimension started to enjoy their freedom.
- The 2nd Dimension appeared in Phineas and Ferb The Movie: Across The 2nd Dimension