It has now been five years since Danny defeated his arch enemy Vlad Plasmius.
At this time, Danny is considered a hero. Not just by the citizens of Amity Park. But the world as well.
But even though Danny has finally defeated the most powerful ghost that he has ever faced, many ghosts still want revenge.
One of these ghosts was Skulker. He is widely-regarded as "The Ghost Zone's Greatest Hunter".
One day,Skulker had a plan. He knew that Danny and his girlfriend Sam would eventually return to The Ghost Zone to explore some unfamiliar areas in it. So he waited for a long time.
Meanwhile, at Casper High
Danny : Sam, we should visit Casper High.
Sam : Why would we do that? We not in highschool anymore.
Danny : Yeah. But it's Mr. Lancer's birthday today.
Sam : Alright. It's been a while since we've seen the old man anyway.
At Lancer's classroom,
Sam and Danny : Surprise!
Mr. Lancer : Woah! Didn't expect you to two to be here. Mostly because you treated your teachers in a disrespectful manner
Danny : Oh come on Mr. Lancer! Lighten up. Especially since it's your birthday.
Sam : Plus, our batch in highschool that you considered " the worst" are now the nicest people in college.
Mr. Lancer : Oh really? I just got reminded of that when I saw the two of you.
Danny : We now Mr. Lancer. And on nehalf of our batch, I apologize.
Mr. Lancer : No need to apologize Danny. You know, students sometimes teach their teachers a lesson without them noticing it.
Mr. Lamcer : In fact, your batch was the one that made me enjoy teaching again.
Mr. Lancer : You made me realize that there's more to being a teacher than giving you homeworks and quizzes.
Suddenly, the bell rang
Danny : Well, I guess we better get going.
Sam : Happy birthday again Mr. Lancer.
Mr. Lancer : Thank you both. Hopefully you can visit again sometime.
Sam : You got it Mr. Lancer.
The two immediately go to Fenton Works