Vlad Masters places a bounty on Danny's head, luring ghost hunters from around the world to Amity Park in order to hunt the ghost kid.
Danny and Valerie (the ghost-hunting teen) are forced to work together in order to defeat Skulker in the Ghost Zone.
Vlad returns and provides an opportunity for emotionally distant Danny and his mom to bond at a weekend mother/son science seminar.
Paulina discovers Danny's secret and Johnny 13 returns. Kitty, Johnny's girlfriend overshadows Paulina's body in a plot to make Johnny jealous.
The cat is out of the bag - Amity Park learns about the ghost kid and Danny becomes Public Enemy #1.
Jazz falls for a hunky boy ghost - Johnny 13 - who has the power to cast his shadow out and create bad luck for everyone who crosses him, especially the girls he's dating.
Halloween special - Danny battles the powerful Spirit of Halloween, the Fright Knight, for an enchanted sword.
Danny must balance the pressure of being a good student and a super hero by acing a make-up test while saving the world from Technus - ghost master of technology.
Danny and Sam's friendship is jeopardized by the ghostly Ember's mystical powers, fed by the rock-idol worship of teens.
A girl at Danny's school has dedicated her life to hunting ghosts!
Jazz has noticed a change in Danny ever since the lab accident and signs him up for therapy.
Danny knocks his parents anniversary gift into a ghost zone. Desperate to get it back, he jumps in and instead gets thrown into prison with every ghost he's ever caught.
Danny meets his evil opposite in Vlad Plasmius - a childhood rival of his father that got ghost powers in an accident.
When a ghost that can grant wishes gives Tucker ghost powers, Danny finds himself dealing with his friend's jealousy in the worst way possible. He has to fight him.
After some run-ins with Dash, the school bully, Danny uses his powers to get revenge and triggers the ghost of Poindexter, a kid who haunts his old locker.
Danny needs quick cash to buy clothes for his first homecoming party so he starts selling all his parents' ghost-infected, mechanized junk at a yard sale.
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