Joe and Anthony Russo reveal the closest Avengers 4 title guess they?ve heard thus far. Originally a two-parter, Marvel Studios eventually decided to split the twin Avengers sequels. And while the third installment of the sub-franchise retained the Infinity War tag, the Phase 3 capper remains untitled as of now, becoming a fan-favorite topic of discussion. Many initially presumed the reason the company is holding back the announcement of the title is because it may be a spoiler for its predecessor, but that may not be the case.