Aidan Gallagher portrayed the youngest of the Harper Quad for 4 seasons on Nicky, Ricky, Dicky, and Dawn! Check out his transformation through the years from the premiere in season 1 to the finale in season 4 (2014-2018)! #AidanGallagher #NRDD #Nickelodeon ►► Subscribe for More: at.nick.com/Subscribe ►► Watch More from Nick: at.nick.com/NewNickVideos ►► SpongeBob on YouTube: at.nick.com/SpongeBobOfficial ►► NickRewind on YouTube: at.nick.com/NickRewind ►► All That on YouTube: at.nick.com/AllThat ►► What’s On TV? : at.nick.com/TVSchedule Catch More on Nick! GET MORE NICKELODEON: Like Nick: at.nick.com/Facebook Follow Nick: at.nick.com/Twitter Nick Instagram: at.nick.com/NickIG Like SpongeBob: at.nick.com/SpongeBobFacebook Follow SpongeBob: at.nick.com/SpongeBobTwitter SpongeBob Instagram: at.nick.com/SpongeBobIG Like NickRewind: at.nick.com/NickRewindFacebook Follow Nic...