Ernie and Judy's mission to intercept an evil wolf serum at the Central Park Spooktacular a little off-track when they meet Emma and Zuri. Back home, K.C. and Marisa throw a Halloween shindig of their own, with K.C. deciding to dress up as a spy in the hopes of impressing River, the new boy in school.
- Zendaya as K.C. Cooper
- Veronica Dunne as Marisa Miller
- Kamil McFadden as Ernie Cooper
- Trinitee Stokes as Judy Cooper
- Tammy Townsend as Kira Cooper
- Kadeem Hardison as Craig Cooper
- Peyton List as Emma Ross
- Skai Jackson as Zuri Ross
- Rick Hall as Agent Johnson
- James DiGiacomo as Petey Goldfeder
- Chris O'Neal as River
- This is K.C. Undercovers first crossover & Halloween episode.
- Jessie stars Peyton List and Skai Jackson will guest star in this episode.
- Scenes with Emma and Zuri most likely happened while they were still in Spooktacular before going to Stuart's party.
- This is part of Disney Channel's Spooktacular weekend featuring two-characters crossovers in each show. Ernie and Judy appeared on Austin & Ally: Scary Spirits & Spooky Stories.
- This episode aired early on Watch Disney Channel & Xfinity on demand.
- October 29, 2015 (Poland)
- October 30, 2015 (Latin America, Brazil, Spain and Portugal)
- December 22, 2015 (Israel)
| To view the All Howls Eve gallery, click here.