"Once in a Purple Moon" is the second segment of the forty-third episode of The 7D. It premiered on October 29, 2016 alongside "Water Ya Doin' Dopey", and is the second segment of the nineteenth episode of the show's second season.
- Originally this episode was going to premiere on October 15, but the schedule was changed with this episode moved to October 29.
- Each of the 7D undergo great transformations under different colors of moonlight.
- The red moon causes Happy turn into a werewolf-type being.
- The blue moon causes Grumpy turns into a joyful business salesman.
- The orange moon causes Bashful turn into a muscle brute.
- The yellow moon causes Sleepy turn into a fully awake lunatic.
- The green moon causes Dopey turn into a weregoat.
- The indigo moon causes Sneezy turn into a living ragdoll.
- The violet moon causes Doc turn him into a goofy idiot.