Danny is desperate to pass a standardized test called the C.A.T. After a fight with Box Lunch from the future, he goes through Lancer's suitcase and ends up with the answers to the C.A.T. He ends up, along with Sam and Tucker, taken into the future, after Clockwork tries to kill him. Danny find out that his cheating on the test ends up causing the death of his family and friends 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, destroying Vlad's castle, and killing Danny's human half. Dark Danny tries to make sure that Danny's horrible future comes true, but Danny defeats his evil half, but before he goes in the thermos he says, "Too weak to escape, then you're too late to save them!" Before his family and friends 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
- Danny Phantom: Season 2
- Danny Phantom: Season 2, Part 1
- Danny Phantom: Season 2, Part 2
- Danny Phantom: The Complete Series
- 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 to make it into the countdown.
| "Gee, this is harder than I thought."|
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