The Ultimate Enemy

"The Ultimate Enemy" is a special hour-length episode of Danny Phantom.
==Synopsis==
Danny is desperate to pass a standardized test called the Career Aptitude Test (or C.A.T. for short). After a fight with Box Lunch (the future daughter of the Box Ghost and the Lunch Lady), he accidentally phases through Lancer's suitcase and ends up with the answers to the C.A.T. When Danny realizes he's gotten his hands on the answers, Sam and Tucker berate him the next day for considering cheating on the test. Lancer overhears them talking and, after school, tells Jazz that Danny has until the day of the test to return the answers.
Later, Danny has a battle with another ghost from the future - Skulktech 9.9, a ghost made from the combined forces of Skulker and Technus. After the fight, Danny, Sam, and Tucker are accidentally transported to the future and into the lair of the ghost who sent Box Lunch and Skulktech to the present in the first place, Clockwork.
Danny finds out that if he does cheat on the test, it will eventually lead to the death of his parents, Jazz, Sam, and Tucker due to an explosion at the Nasty Burger, and thus he let Vlad take the ghost half out of him. This unfortunately led Danny's ghost to take Vlad's ghost half out, causing the two ghosts to mix together, creating Dark Danny, who then destroyed Vlad's castle and killed Danny's human half.
Dark Danny goes to the present time, disguised as the present-day Danny, to make sure that his horrible future comes true, but with the unexpected help of Vlad's future self, the real Danny is eventually able to return to the present and defeats his evil future self in battle. Unfortunately, the battle takes him so long that he is unable to rescue his family and friends. Fortunately, before they can be killed by the explosion, Clockwork saves them all. In the end, Danny chooses not to cheat on the C.A.T., and Jazz tells him she knows that he's half ghost.
==Home video releases==
;DVD
* Danny Phantom: Season 2
* Danny Phantom: Season 2, Part 1
* Danny Phantom: Season 2, Part 2
* Danny Phantom: The Complete Series
;iTunes
* Danny Phantom: Season 2
==Notes==
* This episode is tied with "Maternal Instinct" as creator Butch Hartman's favorite Danny Phantom episode.
* This episode was ranked #10 in The 100 Greatest Nicktoon Episodes countdown, and was the highest-ranking Danny Phantom episode in the countdown.
* Steve Marmel had planned for Dark Danny to reappear in the show's third season, but due to his being fired from the series, this plan was abandoned. Dark Danny would eventually return in the graphic novel Danny Phantom: A Glitch in Time.
==Gallery==
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==External links==
* Danny Phantom Wiki: 
* 
Category:Nicktoon specials