Diesel's got so much going on it's a wonder that he has time for Marvel movies. Luckily, he only has one line to remember and he gets to deliver it wearing sweatpants in a vocal booth. He's reprised his role as Groot in the Guardians sequel, and even though none of his contractual obligations have been made public, it's expected he'll be back for the third one. We know he's in Infinity War, and since the Guardians seem to be in both Avengers movies, we can expect him in Avengers 4, too.
Before shooting had even started on Ant-Man, Lilly was locked in for a multi-movie deal that includes recently wrapped sequel Ant-Man and the Wasp. “When I signed on with that contract, I knew there was a chance I would never do another Marvel film, but they make you sign them anyway,” Lilly said prior to the first film's release. “I hope I actually get to fulfill that contract.” Happily, it's since materialised that she will – Wasp will apparently appear in Avengers 4, and not Infinity War.
We haven't seen a lot of Brolin as the MCU's big bad Thanos, but we're certainly going to be well acquainted by the time Infinity War and Avengers 4 end. After cropping up in post-credits scenes, and a larger role in Guardians of the Galaxy, his quest to acquire all of the Infinity Stones will conclude with the 2018 and 2019 sequels. Assuming he gets his comeuppance, that's likely his lot - but this being Marvel, who knows what twists may be in store?
Cumberbatch’s deal kicked off in 2016 with Marvel’s first dip into the supernatural realm. Given Doctor Strange's popularity, it was inevitable that Marvel would retain the brainy Brit’s talents, and sure enough he's one of the most exciting names confirmed for Infinity War. He popped up in Thor: Ragnarok too, of course, ticking another movie off. A five-film contract would also cover Avengers 4 and a Doctor Strange sequel. With any luck, his real deal is much longer than that.
Cumberbatch wasn’t the only impressive new actor joining the MCU ranks in Doctor Strange. Chiwetel Ejiofor assumed the role of Mordo, and based on that second end-credits scene, he sure looks like he’ll be back if a Strange sequel happens. But the details of his contract aren’t too broadly known, so there’s no saying for certainty whether Ejiofor has already been tapped for such a project. And of course, just about any MCU actor seems to have the potential for at least a cameo in Avengers: Infinity War, but there's no suggestion of an appearance in that one thus far.
With Marvel introducing more heroes from its vast pantheon, one of the most eagerly anticipated updates was casting Brie Larson as Captain Marvel. Not only will she be stepping into Carol Danvers’ shoes in her own solo movie in 2019, but she's also on that Disney casting call list for – wait for it! – Avengers: Infinity War. Come on, look a bit surprised. No word whatsoever on a long-term contract, but GR+ delightedly predicts that she'll be making Marvel movies well into the twenties.
In a movie full of scene stealers, Tessa Thompson's Valkyrie still managed to stand out, and thankfully we know she's coming to Infinity War, too. She was spotted on set in May. Whether she'll crop up in Avengers 4 or not is a mystery, and if there will ever be more Thor movies, she's surely an essential part of the ensemble. Let's wait and see.