http://www.pcgamer.com/the-overwatch-halloween-terror-2017-event-puts-a-new-twist-on-junkensteins-revenge/

Like the vengeful spirit of a demonic prom queen, the Overwatch "Halloween Terror" event has returned!   

"For the next three weeks, we’re celebrating the spookiest time of the year with a seasonal event. Expand your collection of seasonal-themed items and relive a chilling tale in our PvE brawl: Junkenstein's Revenge," Blizzard wrote.