Honorable mention. The final boss from Sonic 3 & Knuckles.
You have to understand, that first of all, a lot of us didn't even get Super Sonic in Sonic 2, because the special stages were too difficult. So being capable of getting Super Sonic in Sonic 3 was already like "wow, this is amazing". And then & Knuckles comes out, and you discover fucking HYPER SONIC. That's a whole nother level of amazement.

Then you defeat the supposed final boss like you have before. And suddenly, you're in a new stage, and Sonic FLYING. You had not fucking idea Sonic could FLY. You're 8 years old, and this is the dopest shit you've ever seen. (Goku turning Super Saiyan won't air on Toonami until another 5 years