Wander Over Gravity Falls with Phineas and Ferb

 is a crossover between Phineas and Ferb and Gravity Falls.

Overview
Phineas and Ferb's Summer Vacation starts when their family takes a vacation to Gravity Falls, Oregon. There, Phineas and Ferb suddenly get wound up with the Mystery Twins, Dipper and Mabel as they start exploring for the day. Wander wanders over Gravity Falls for refuge from an attack from the Hater Army and bumps into Phineas, Ferb, Dipper, and Mabel. From there on out, all five ride on Sylvia on an exciting adventure and chase from the Hater Army.

Meanwhile, Dr. Doofenshmirtz uses the supernatural side of Gravity Falls as his source for his newest supernatural evil scheme to control everything that is supernatural in the world. When Lord Hater sees this, he uses this as an opportunity to corner Wander and Sylvia, as well as the other four that are helping them, and capture all of them and thus teams up with Doofenshmirtz. It is up to Agent P to ultimately defeat Dr. Doofenshmirtz and Lord Hater while not potentially blowing his cover.

Other story elements include Candace and Wendy becoming good friends with Soos somehow falling in love with her, and Grunkle Stan needing the aid of a good old friend, Major Monogram, for certain reasons for the Mystery Shack.

Major Cryptograms
"FDHVDU KDV JRQH PLVVLQJ, ZMW HL SZH ZGYZHS."

"ZBZ, CUVARNF NAQ SREO PEBFFRQ BIRE JVGU TENIVGL SNYYF!"

"TEHAXYR FGNA NAQ ZNWBE ZBABTENZ SRYY VA YBIR JVGU RNPU BGURE."

Background Information

 * This is the first crossover special for Phineas and Ferb, Gravity Falls, and Wander Over Yonder.

Production Information

 * The special uses a different animation style so that characters from Phineas and Ferb, Gravity Falls, and Wander Over Yonder meld together "perfectly".

Continuity

 * It will be the show's third one-hour special after Phineas and Ferb Summer Belongs to You and Phineas and Ferb: Mission Marvel.
 * This is the second crossover special for Phineas and Ferb. (Phineas and Ferb: Mission Marvel)

Credits
Main Cast: Also Starring:
 * Vincent Martella as Phineas Flynn
 * Thomas Sangster as Ferb Fletcher
 * Ashley Tisdale as Candace Flynn
 * Dee Bradley Baker as Perry the Platypus
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Kristen Schaal as Mabel Pines
 * Jason Ritter as Dipper Pines
 * Alex Hirsch as Grunkle Stan and Soos
 * Linda Cardellini as Wendy
 * Jack McBrayer as Wander
 * April Winchell as Sylvia
 * Keith Ferguson as Lord Hater
 * Tom Kenny as Peeper
 * Alyson Stoner as Isabella Garcia-Shapiro
 * Bobby Gaylor as Buford Van Stomm
 * Maulik Pancholy as Baljeet
 * Caroline Rhea as Linda Flynn-Fletcher
 * Richard O'Brien as Lawrence Fletcher
 * Kevin Michael Richardson as Sheriff Blubs
 * Keith Ferguson as Deputy Durland
 * Jennifer Coolidge as Lazy Susan
 * Thurop Van Orman as 'Lil Gideon