https://www.pcgamer.com/overwatch-halloween-skins-revealed/

Overwatch's Halloween Terror seasonal event returns for 2018 today, and it brings a heap of new spooky skins for Overwatch heroes new and old. The skins include Swamp Monster Doomfist—AKA Doomfish—and a sweet Enchanted Armor skin for Pharah. Also Wrecking Ball is a pumpkin now. 

Like the previous seasonal events, skins from last year's Halloween Terror event are also available for unlock at the price of normal, non-event skins.