This page explains in detail the interactions between the Call of Duty series and the Halloween series.
Call of Duty: Ghosts DLC Onslaught[]
January 28, 2014
In Call of Duty: Ghosts there is a DLC pack called Onslaught, this features a stage called Fog, which sets place in a sterotypical horror set. If you complete a field order you can actually become Micheal Myers with 1 hit kills.