Kalit so'z Dreamscape

Twin brother and sister Dipper and Mabel Pines are in for an unexpected adventure when they spend the summer helping their great uncle Stan run a tourist trap in the mysterious town of Gravity Falls, Oregon.

Marianne is in bed after falling from her horse. She occupies herself by doodling in a sketch book, drawing a boy inside a bare house. When Marianne falls asleep, she finds herself outside the very house that she drew.