The family becomes marooned after a summer storm shipwrecks them on an island, and Phineas, Ferb and Isabella use the opportunity to build a Swiss Family style tree house. Meanwhile, Candace tries to get them to build a boat so she can get back in time for Jeremy's party. After finding out what "big laundry" meant, Dr. Doofenshmirtz uses free monkey labor to boost a new laundromat business.
On the boat and island
Agent P's mission
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"Oh, There You Are, Perry"
"Hide and Seek"