Update: According to info I've received, this will be a "Boss Raid" event!
Trick-or-treat! TRANSFORMERS: LEGENDS will be kicking off a Halloween-themed episode, Ghost in the Machine on October 30, which will run through November 5.
Taking advantage of the weakened barrier between the physical world and the ethereal plane, Starscream’s ghost crosses over to lead a fearsome band of Decepticons against the Autobot Headmasters. Using the electromagnetic radiation from his ghostly form, Starscream is attempting to disrupt the Autobot’s electronics to render them powerless.