Ruby Gloom

Once in a Blue Luna (1x15)

Air date: Apr 09, 2007

Ruby and her friends camp out in the woods in search for the legendary Luna monster, a creature who comes out every blue moon. While they wait, the gang starts telling stories about the Luna and they all start getting scared, especially Ruby who won't admit that she's scared because everyone thinks she's really brave. (From: http://rubygloom.wikia.com/)