"What's the Big Idea?" is the first segment of the 2nd episode in Season 1 of Let's Go Luna!.
In Mexico City, Andy desperately wants to find a big surface to paint on and learns about murals in the process.
"What's the Big Idea?" was released to PBS Kids' website and video on October 22, 2018.
In the episode premiered on November 21 on PBS Kids at 9:00 AM ET, and on the 24/7 channel on November 22 at 5:00 PM ET.