Our Nickelodeon nostalgia was through the roof when the Fairly OddParentsDanny Phantom and T.U.F.F. Puppy crews all met up with the characters in Bunsen The Beast.

All four shows, created by Butch Hartman, met up in an animated short, aptly titled The Fairly Odd Phantom, and we couldn’t get over their meeting for the first time.

Well, if you want to know how that crossover came to life, Nick Animation released a video that gives a behind-the-scenes look at how The Fairly Odd Phantom came to be. Check out the clip below!

Read more: Watch your favorite Nickelodeon cartoon characters meet in this new short

The video shows the voice artists doing what they do best, giving us a sneak peek into how those characters come to life—plus, it gives a real-life face to some of the voices we’ve recognized for years!

Our favorite appearance? iCarly’s Jerry Trainor, who happens to voice Dudley on the show T.U.F.F. Puppy.

Check out the full video below!

Last weeks animated short was the first new Danny Phantom animation in TEN years. Fairly OddParents first aired as shorts in 1998. It aired as a series from 2001 to 2006, and then again from 2008 to the present. Danny Phantom ran from 2004 to 2007 while T.U.F.F. Puppy ran from 2010 to 2015.

Bunsen And The Beast made its debut last week on Nickelodeon.

If you want to enjoy this nostalgic short after seeing how it was made, you can watch it in full here.