• Debby Ryan plays the title role in the Disney Channel sitcom "Jessie."

Debby Ryan plays the title role in the Disney Channel sitcom "Jessie." (Photo : Instagram/Debby Ryan)

In "Jessie" season 4 episode 18 titled "The Ghostest With The Mostest," which airs on Oct. 3, Saturday, on Disney Channel, Jessie Prescott (Debby Ryan) asks the children Emma Ross (Peyton List), Luke Ross (Cameron Boyce), Ravi Ross (Karan Brar) and Zuri Ross (Skai Jackson) to bring Stuart Wooten (J.J. Totah) along for trick-or-treat.

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 "Jessie" season 4 episode 18 "The Ghostest With The Mostest" was written by Pamela Eells O'Connell. In the episode, Stuart Wooten tells the Ross children a story about a ghost named Abigail. He tells them that the ghost is on the loss and is out to get them. Mysteriously, the children disappear one by one.

The responsibility to solve the mystery surrounding the ghost named Abigail and finding the Ross kids falls on the shoulders of Jessie, who goes to a masquerade party.

In addition, Disney stars Austin North and Sarah Gilman will appear in "Jessie" season 4 episode 18 "The Ghostest With The Mostest" playing their respective "I Didn't Do It" characters Logan Watson and Delia Delfano.

Created by O'Connell, "Jessie" premiered on Disney Channel on Sept. 30, 2011. In March, the actress who plays the title role in the show told Entertainment Tonight how happy she is that the Disney Channel sitcom reached the 100-episode milestone. She said, "Reaching a hundred episodes is insane."

The opening theme of the sitcom titled "Hey Jessie" is performed by Ryan. It was not confirmed whether or not she also sang during the wedding of his brother Chase Ryan at Disneyland over Labor Day weekend, where she wore suit, J-14 reported.