Super Intros are a special animation showing off that a hero is about to do a Super Skill!
By default, you will see the intro only the first time you see the character use it.
If you turn the setting ON, in game settings, you will see the super intro every time they use it.
Characters with a Super Intro:
Leonardo
Raphael
Michelangelo
Donatello
Casey Jones
Super Irma
Rocksteady
Bebop
Baxter
Mona Lisa