The best episode written by Alex Hirsch is "Not What He Seems", rated 9.315/10 from 27 user votes. It was "directed by Stephen Sandoval". "Not What He Seems" aired on 3/9/2015 and is rated 0.2 point(s) higher than their second highest rated, "A Tale of Two Stans".
After agents Powers and Trigger take Stan into custody, Dipper and Mabel begin to wonder how much they actually know about their Grunkle Stan.
Director: Stephen Sandoval
Writer: Alex Hirsch
Cornered underneath the Mystery Shack, Stan must finally reveal the secrets of his past and his mysterious portal to Dipper and Mabel.
Director: Sunil Hall
Writer: Alex Hirsch
Bill has returned to take down the Pines family. But this time he has brought some of his friends with him.
Director: Sunil Hall
Writer: Alex Hirsch
Pacifica enlists Dipper’s help to rid the Northwest Mansion of a ghost before he wreaks havoc on her fancy party.
Director: Matt Braly
Writer: Alex Hirsch
Li'l Gideon swindles the Mystery Shack away, forcing Grunkle Stan and the kids to move in with Soos. While Stan weighs how he can still care for his grandniece and nephew, they decide to take on Gideon.
Director: Joe Pitt
Writer: Alex Hirsch
Dipper’s secret journal pages lead him and the gang to the author’s hidden bunker where they find themselves face-to-face with a mysterious figure from Gravity Falls’ lore.
Director: Joe Pitt
Writer: Alex Hirsch
Dipper, Soos and Wendy must save Mabel from a strange new world, while Bill's forces plan their next move.
Director: Matt Braly
Writer: Alex Hirsch
Mabel makes plans for her and Dipper's 13th birthday party; Dipper ventures below the town and discovers its most shocking secret.
Director: Stephen Sandoval
Writer: Alex Hirsch
Dipper wants to correct a mistake he made in the past with assistance from a time machine. Mabel is overjoyed when she wins a pet pig at a fair.
Director: Joe Pitt
Writer: Alex Hirsch
Dipper, Mabel, and Soos must travel through Grunkle Stan's mind to defeat a tricky dream demon summoned by Lil Gideon.
Director: Joe Pitt
Writer: Alex Hirsch
After being challenged to a video game battle by Robbie, Dipper is shocked when his favorite playable fighter, Rumble McSkirmish, comes to life to defend him. But Dipper soon loses control over Rumble McSkirmish and has to find a way to stop him.
Director: John Aoshima
Writer: Alex Hirsch
Blendin returns to face off with Dipper and Mabel in a futuristic battle that could trap them forever in time jail.
Director: Matt Braly
Writer: Alex Hirsch
A new threat leads Mabel to venture into the enchanted realm of the unicorns. Meanwhile, Dipper learns an unexpected twist about the enigmatic Bill Cipher.
Director: Matt Braly
Writer: Alex Hirsch
The Pines family is starting to get everything back to normal after the Lil' Gideon incident. They throw a “Mystery Shack Is Back” party, but some unwelcome guests intend to crash it.
Director: Rob Renzetti
Writer: Alex Hirsch
Twins Dipper and Mabel Pines visit their eccentric great-uncle for a summer in Gravity Falls, Oregon, where he operates the world's most bizarre museum. As soon as the twins arrive in Gravity Falls, they discover something amiss in the remote town.
Director: John Aoshima
Writer: Alex Hirsch
The kids, along with Old Man McGucket's help, discover there is a secret society in Gravity Falls.
Director: Sunil Hall
Writer: Alex Hirsch
Dipper finds an unlikely friend to join him with his newest obsession, a board game called “Dungeons, Dungeons & More Dungeons.”
Director: Stephen Sandoval
Writer: Alex Hirsch
After Flapjack finds a pair of legs adrift at sea, Captain K'nuckles uses them to terrorize the people of Stormalong Harbor. However, when a sea monster's torso comes to reclaim the legs a battle for ownership ensues.
Director: N/A
Writer: Alex Hirsch
Soos needs a date for his cousin Reggie's engagement party and looks to a dating simulator game to help him talk to girls.
Director: Matt Braly
Writer: Alex Hirsch
Stan throws a big weekend party to promote the Mystery Shack. Dipper makes clones of himself to impress Wendy. Mabel fights for the Party Queen title in honor of her two friends.
Director: Joe Pitt
Writer: Alex Hirsch
Dipper and Mabel go trick-or-treating in the summer and encounter a candy-loving monster who threatens to devour them if they don't bring him sweet things to eat.
Director: John Aoshima
Writer: Alex Hirsch
Dipper is invited by Wendy and her teen friends on a trek that leads to an abandoned convenience store that may be haunted.
Director: Joe Pitt
Writer: Alex Hirsch
Mabel decides to put on a sock puppet rock opera to impress a local puppeteer, but her show goes awry when Dipper's drive to uncover more of the journal's secrets leads to a supernatural disaster.
Director: Joe Pitt
Writer: Alex Hirsch
The twins discover a hidden room inside the Mystery Shack and compete over who should have it.
Director: Joe Pitt
Writer: Alex Hirsch
When Waddles is snatched by a prehistoric beast, Dipper, Mabel, Stan, Soos, and Old Man McGucket must journey to a mysterious land trapped in time to rescue him.
Director: John Aoshima
Writer: Alex Hirsch