sorry to put this off but here it is. the finale.

When phineas, marlin and dory got back underwater...

Phineas is trying to put on a brave face but can't. He screams in a sobbing voice. 'Why, universe? Why take her life? Take me instead!

Marlin tries to comfort him 'a little extreme don't you think?'

phineas still hurt about what happened states 'you don't get it. marlin. You and your love interest had time to get married before she died. Isabella was in love with me and i never knew until recently. Therefore we didn't have time to get married before you know.

All of a sudden a familiar sounding rainbow fish shows up

Isabella says from behind in her usual charming voice. 'whatcha doin?'

phineas is still hurting 'now the universe is trolling me with her voice '

Isabella tries again. 'Phineas, I'm ok.'

phineas confusedly turns around and sees her behind him, still in her rainbow fish form. He giddily exclaims 'Isabella! you're not dead! but how?'

Isabella explains the situation 'the dead thing was a ruse to fool that horrible fish murdering girl and I'm sure Nemo is on his way into the sea. Plus I miss Danville and our friends. Besides I'd like to start that future where you and I become the aunt and uncle of candace and Jeremy's children Xavier, fred and Amanda so can we go home now?'

Phineas replies in a tone that implies he too had enough here. 'yes, yes we can '. so everything worked out on both sides. the end