https://www.gamespot.com/articles/new-overwatch-archives-event-blackwatch-features-a/1100-6457965/

Blizzard has unveiled Retribution, a new mission that will be coming to Overwatch as part of the Overwatch Archives event. Like 2017's Uprising, which allowed players to experience Tracer's first ever mission as part of Overwatch, Retribution delves into another key moment in the series' lore.

"Travel eight years into the past and join Blackwatch as they seek to capture a high-ranking member of the Talon organization," Blizzard explains. "Fight in the streets of Venice as Genji, Moira, McCree, or Reyes (later known as Reaper) to complete the mission and unlock pieces of the past with over 100 items from last year and 60 new ones—including highlight intros, emotes, sprays, and more."