Invisible Sister
(L - R) Karan Brar, Will Meyers, Rowan Blanchard and Austin Fryberger star in the new Disney Channel original movie, "Invisible Sister." Catch the premiere during Disney's "Monstober" event on Friday, Oct. 9. Disney Channel

It wouldn’t be Halloween without Disney Channel’s month-long celebration, “Monstober.” The Mouse House is once again celebrating the spooky holiday with Halloween-themed TV episodes, movies and specials … all kicking off on Thursday, Oct. 1!

The big highlight for the 2015 event is the premiere of Disney Channel’s original movie, “Invisible Sister.” The new TV flick stars Rowan Blanchard (“Girl Meets World”) as a “young science prodigy” name Cleo. Cleo has always been in the shadow of her older sister Molly, played by Paris Berelo (“Mighty Med”) … until one of Cleo’s science experiments turns Molly invisible! Together the sisters must convince everyone that nothing is wrong, all while Cleo prepares to help her sister out in the upcoming big lacrosse game.

While Disney fans won’t want to miss “Invisible Sister,” the network also plans on playing old Halloween favorites, like “Halloweentown” and “My Babysitter’s A Vampire.” Check out some of the premiere highlights from the Disney Channel “Monstober” 2015 schedule below:

Friday, Oct. 2

  • 8 p.m. ET – “Jessie” – In this new Halloween special, titled “The Ghostess with the Mostest,” Austin North and Sarah Gilman of “I Didn’t Do It” guest star. Jessie and Stuart take the Ross kids trick-or-treating and tell them a ghost story along the way.
  • 8:30 p.m. ET – “Girl Meets World” – “Austin & Ally” stars Ross Lynch and Laura Marano guest star in this Halloween episode, “Girl Meets World of Terror 2.” In the holiday special, Riley and Maya meet a flapper girl from the 1920s … who also turns out to be the ghost of the bay window.
  • 9 p.m. ET – “I Didn’t Do It” – “Austin & Ally” fans won’t want to miss Raini Rodriguez and Calum Worthy in this spooky new Halloween special, titled “Bite Club.” Logan and Delia meet up with Trish and Dez (and a “crazy fortune teller”) are a huge Halloween party in New York City. Meanwhile, Garrett concocts a “major candy scam” with Bett’s nephew.
  • 9:25 p.m. ET – “Mickey Mouse” – Think Mickey Mouse doesn’t get scared? False! The famous mouse must “save face” after getting frightened in front of Minnie Mouse.

Sunday, Oct. 4

  • 8 p.m. ET – “K.C. Undercover” – “Jessie” and “BUNK’D” stars Peyton List and Skai Jackson shake things up in this Halloween episode, “All Howl’s Eve.” While Marisa and K.C. throw a Halloween party at the house, Ernie and Judy try to intercept “an evil wolf serum.”
  • 8:30 p.m. ET – “Best Friends Whenever” – Rowan Blanchard and Peyton Meyer of “Girl Meets World” guest star in “Cyd and Shelby’s Haunted Escape.” The duo find themselves trapped in a haunted house at New York City’s Central Park Spooktacular with Cyd and Shelby.
  • 9 p.m. ET – “Austin & Ally” – The group, joined by “K.C. Undercover” stars Kamil McFadden and Trinitee Stokes, tell scary stories at Central Park’s Spooktacular party.
  • 9:30 p.m. ET – “Liv and Maddie” – “Best Friends Whenever” stars Landry Bender and Lauren Taylor guest star in “Haunt-A-Rooney.” Maddie gets involved in the “Senior Scare” prank while Liv gets into a “precarious predicament with a photographer” … and a flash mob somehow comes into play.

Friday, Oct. 9

  • 8 p.m. ET – “Invisible Sister” premiere – Can Cleo find an antidote to save her sister Molly before she becomes permanently invisible?

Sunday, Oct. 11

  • 8 p.m. ET – Disney/ Pixar’s “Monsters University”

Friday, Oct. 23

  • 6 p.m. ET – If you love “Liv & Maddie” then you won’t want to miss the “MAL-OWEEN marathon.” The Disney Channel will air fan favorite “Liv & Maddie” episodes, followed by the “Descendants” movie, the “Descendants: Set It Off!” special and “Descendants: Wicked World” animated shorts.

Thursday, Oct. 31

  • 9 a.m. ET – The fun begins at 9 a.m. and runs until 10 p.m. ET. Catch encore airings of the Halloween-themed episodes during the “Spooks & Chills” marathon.

What are you looking forward to watching during Disney Channel’s “Monstober” celebration? Tweet @AmandaTVScoop.