H2O: Just Add Water and Gravity Falls Crossovers
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Ghostly Mer-Twins by Vampiresdude reviews
40 years after P.P. Danny's daughter had twins. Thirteen years later Dipper and Mabel Pines(the twins) spend their next summer with Grunkle Stan in Austrailia. Secrets will be revealed and mysteries uncovered.
Rated: K+ - English - Adventure/Supernatural - Chapters: 1 - Words: 557 - Reviews: 3 - Follows: 1 - Published: 6/30/2013 - Cleo S., Emma G., Dipper P., Mabel P.
Gravity Falls: Just add water by Mysticalanimallover reviews
This is a story of three friends who get turned into merpeople.
Rated: T - English - Supernatural/Adventure - Chapters: 1 - Words: 279 - Reviews: 6 - Favs: 5 - Follows: 4 - Published: 6/12/2013 - Dipper P., Mabel P., Wendy