What EPISODE do Danny and Sam get together in Danny Phantom?

The episode that featured them (Danny & Sam) finally becoming a couple, is a TV movie called Phantom Planet - Danny Phantom's series finale.

Phantom Planet is the series finale of Danny Phantom. It premiered on Nickelodeon on August 24, 2007 as a one-hour episode consisting of two parts (the 52nd and 53rd episodes, respectively). It is the fourth and final Danny Phantom TV movie.

Synopsis

Vlad concocts a plan to humiliate Danny into hiding, unbeknownst to him that the world will need a hero when an asteroid hurtles toward Earth, threatening not only Earth, but the Ghost Zone as well. Vlad reveals his ghost-half to the entire world in order to gain world domination, but fails. Danny convinces every ghost to turn the whole Earth intangible to save it. Jazz ends up telling her parents Danny's secret after the Fenton jet crashes and they think Danny's inside. Danny reveals his secret to the world, which is accepted with great enthusiasm, gets a statue in the capital of every country, and ends up finally dating Sam. - Dannyphantom.wikia.com.

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Friday, August 18 2017
Source: https://www.youtube.com/watch?v=067UIqwx_Qo