Danny Phantom 1x02 "Parental Bonding"

Danny has a major crush on the school's most beautiful girl, Paulina. He asks her to go to the big dance with him by giving her an amulet he found. When his still-unpredictable ghost abilities cause problems at school, Mr. Lancer requests a parent-teacher conference with his dad. Using his newfound ability to "overshadow" or inhabit another's body, he talks his way out of trouble in his dad's body. More trouble awaits at the dance, however, when it turns out that the amulet he gave Paulina turns anybody into a huge ghost dragon when angered.

Note: Danny develops an additional ability to overshadow/possess human bodies.