The Revenge of the Second Dimension

Doofenshmirtz-2 has returned and arrived to the Nefarious Space Station, but this time not alone. It's revealed that the dimension he's from is of a dimension where Team Nefarious is not only ruling the UUniverses, but not completely in the same fashion as the reality visited during Path to Redemption, or at least not anymore, as androids and robots in general are forcefully in coexistence with organic lifeforms. The Anti-Team Nefarious Freedom Fighters are still keeping organic lifeforms, and the alternate variants are the opposite, with a few exceptions including Equestria which gained a modern day setting with technology that can be operated by hooves. After the events of Phineas and Ferb: Across the Second Dimension, Alternate Team Nefarious, which is much different and far more powerful, and given his maniacal personality, makes him more dangerous, has learned about it and wants to do the same thing: use interdimensional transport for conquest. Thus Phineas and Ferb and their pals have to temporarily know about Perry's secret identity, this time not with trust issues because of recalling those memorable events, and get whatever help they can to seal Alternate Team Nefarious permanently back to their native dimension and ensure they acknowledge the consequences of trying to conquer dimensions that can upset the balance of the multiverse.