"The Ghostest with the Mostest" is the eighteenth episode of Season Four of the sitcom Jessie. This episode is part of the Monstober Spooktacular crossover featuring Jessie and I Didn't Do It. It aired on October 2, 2015.
Jessie plans to attend a Central Park Halloween masquerade party after dreaming of meeting a romantic, handsome stranger at such a party. The children are supposed to go trick-or-treating with Stuart, but he tells a story of a lonely ghost girl named Abigail who rises out of the grave to look for 'friends', and one by one, the children start disappearing. Meanwhile, Jessie attends the masquerade, where she is quickly swept off her feet by a handsome, masked stranger, then Emma, Zuri, and Stuart crash the ball and tell Jessie that Ravi and Luke have vanished. Worried, Jessie leaves the ball, promising to return; her mystery date promises to wait for her. Jessie asks Tony to help her search for the others, then Emma and Stuart disappear. When Tony, Jessie and Zuri, then arrive at a haunted house, they learn the children were invited to a party hosted by Stuart – disguised as Abigail as a prank. Jessie is afraid she may never see her mystery man again but decides to return to the ball after knowing the children are safe. When she returns, she finds her handsome mystery man waited for her and he reveals himself to be Tony, who was accepted into the fire department. Now there is no doubt in her mind that there are still sparks between them, and Tony and Jessie finally get back together. Meanwhile, Bertram wants to know who's been stealing his Halloween candy; at the end, the children, Jessie, Bertram and Stuart find out the candy culprit was the real Abigail, which scares them.
- Debby Ryan as Jessie Prescott
- Peyton List as Emma Ross
- Cameron Boyce as Luke Ross
- Karan Brar as Ravi Ross
- Skai Jackson as Zuri Ross
- Kevin Chamberlin as Bertram Winkle
Special Guest Cast
- This episode is part of Disney Channel's "Monstober Spooktacular" crossover, where several characters from the current running live action Disney Channel shows at the time visited each other in the same location on the same night.
- This is the sixth and last crossover of Jessie, the others were Austin & Jessie & Ally: All Star New Year, Good Luck Jessie: NYC Christmas, Halloween Night at the Museum, Jessie's Aloha Holidays with Parker & Joey, & Karate Kid-tastrophe.
- Emma and Zuri would also cross over into the KC Undercover episode "All Howl's Eve".