Benedict Cumberbatch does a spot-on impression of 'Avengers' co-star Robert Downey Jr.: Watch

Benedict Cumberbatch may have spent a bit too much time with Robert Downey Jr. over the past few years.

The actor recently showcased his dead-on impression of his "Avengers: Endgame" co-star, and if you close your eyes, you'll hear Iron Man himself. With the addition of the physical mannerisms, like RDJ's tendency to suddenly stretch his arms mid-sentence, it's a full-on transformation.

SiriusXM host Jenny McCathy was wowed by the impression, cracking up and replying, "That was really good!"

After his remarkable take on Robert, Benedict tried his best Harrison Ford, reciting classic "Star Wars" lines in the actor's signature gravelly voice. But that was nothing compared to what he had on deck: A dead-on Jar Jar Binks voice.

Although it was an impeccable impersonation, it didn't meet the actor's high standards for his work: "Just terrible," he said afterward.

Benedict and RDJ worked together in multiple Marvel movies, but with Iron Man's (spoiler alert) fate sealed at the conclusion of "Endgame," we likely won't see him and Doctor Strange share the screen again going forward.

Benedict, however, has plenty more Marvel in store. The highly-anticipated sequel to his standalone film is due out in 2021, and fans are already speculating about what to expect from "Doctor Strange in the Multiverse of Madness."