Mister Stark, we don’t feel so good.

“Avengers” star Robert Downey Jr., 56, has unfollowed his fellow Marvel cast members on Instagram recently, including Tom Holland, 25, along with his good friend Chris Evans, 40, and it’s got the internet blippin’ out.

This also comes just days before the release of 36-year-old Scarlett Johansson’s first MCU standalone film, “Black Widow,” on July 9.

This social media sequel to the “Avengers” breakup went widely unnoticed over the holiday weekend — but more and more Iron Man/Tony Stark fans are beginning to express their shock online.

“i wasn’t ready for RDJ to unfollow the whole Marvel cast, it’s like the end of an era,” one Marvel fan tweeted.

Another fan demanded Downey Jr. reunite with the cast.

“FOLLOW MARVEL’S CAST ON INSTAGRAM AGAIN NOW,” user @lokipetista tweeted at the actor.

rdj why did u unfollow the whole marvel cast OPEN UP I JUST WANNA TALK

— rhoanna ‎⧗ SUPPORT  (@rrhobarnes) July 2, 2021

Actually, it’s not just MCU people he’s split from — none of Downey’s current 43 followers are actors, prompting other theories unrelated to possible bad blood.

His Instagram bio is also a prompt to “get involved” with Footprint Coalition, an organization of environmental investors that Downey founded.

What is wrong with Robert Downey Jr changing his instagram into business account and unfollowing all his friends :(((((((

— KCA (@Starksterrr) July 1, 2021

Despite the public freakout, Downey, who last reprised his role of Iron Man in the 2019 Infinity Saga conclusion film “Avengers: Endgame,” still follows his former colleagues on his since-active Twitter.

Fans are freaking out as to why Robert Downey Jr. (left) unfollowed fellow Marvel actors, including Chris Evans, on Instagram.Walt Disney Co./Everett Collection

Maybe Thanos had one more trick up his sleeve, but this didn’t seem inevitable.

The Post reached out to Downey’s reps and is awaiting comment.