Okay so I don't know if any of you have ever seen the tv show supernatural, but it is so much like the adult version of gravity falls. I just started watching it (i know i'm a little late), and I watch all the episodes with jrsushilover7. But here is how it is similar to GF. They both are about to siblings discovering mysterys, and both shows have a book that contains all of the odd information. I like GF better but supernatural is pretty epic. My advice, definitly watch it as long as you're not scared of creepy things. VERY creepy things.