User blog comment:Poptropica411/Phineas plus Isabella equals Phineas and Ferb: Across the Second Dimension in Fabulous 2D?/@comment-99.230.39.95-20110130233405/@comment-1478533-20110205214233

Although it'd be fitting, I'd find it somewhat cheap to delay it until the finale. The creators are usually beyond clichés such as "ending it all with a kiss", so I'd expect them to do something different.