David Harbour recently shared a new update on Avengers: Doomsday, offering an early hint about Red Guardian’s role in the upcoming Marvel film. David Harbour teases Avengers: Doomsday will affect Alexei and Yelena’s bondDavid Harbour has shared a new update about Avengers: Doomsday. When asked what he could reveal about Avengers: Doomsday, the actor pointed to the connection between Red Guardian and Yelena. This is not the first time Harbour has hinted at what audiences can expect from Avengers: Doomsday. Avengers: Doomsday, directed by Anthony and Joe Russo, is scheduled to arrive in theaters on December 18, 2026.