For a predominantly head to head multiplayer game, Blizzard have done a pretty good job of fleshing out the characters and creating a world for people to invest in. Part of that has been with time-limited co-op events, collected under the Overwatch Archives name, and it’s coming back for a third time with Overwatch Storm Rising, starting next week on 16th April.
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Strike team deployed. Prepare for Storm Rising April 16 pic.twitter.com/FXOod6hXds— Overwatch (@OverwatchEU) April 9, 2019
The new mission canonically sees hero characters Tracer, Genji, Winston, and Mercy as the Overwatch heroes chasing after the Omnic Talon boss, Maximilien, as a huge storm rolls into his Cuban lair. You’ll also be able to return to  the first two missions, Uprising and Retribution, for a little added variety as you chase after the 160 new cosmetic items to earn.
Source: Twitter