(Warning: The following, though largely based on guesswork, could theoretically contain major plot and cameo SPOILERS for future MCU movies - as well as definitely including a handful relating to ones that have already been released. Proceed with whatever level of caution your natural SPOILER-aversion suggests...)
Now, the Marvel Cinematic Universe has never exactly shied away from its comic book roots, being filled practically to bursting with comic book-y Easter eggs and teases alongside the already established fan favorite characters. As we approach the beginning of Marvel's Phase 3, though, it's worth noting that the MCU is, in fact, increasingly able to self-generate its own Easter eggs and references.
Whether it's the bonus Avenger in Ant-Man, or Chris Evans's shape-shifting appearance in Thor: The Dark World, we've reached a point where the MCU can generate giddy geek glee by simply throwing an actor we've already seen on screen into a movie that we didn't expect them to appear in.
With that in mind, then, it seemed about time to take a look at:
The Next Ten Cameos We'll See in the MCU
Or, rather, let's take a look at the key cameos we could well see in each of the next ten movies in the MCU.
1. Captain America: Civil War Featuring...The Hulk
There have long been rumors that Mark Ruffalo's Bruce 'The Hulk' Banner would be making a surprise appearance in Captain America: Civil War - which would actually make a whole lot of sense. After all, it sounds as though Cap and Tony might need someone to jump into the middle to the fight and smack some sense into the pair of them.
Anyone else totally down for Bruce to roll up and scream "don't make me angry! You wouldn't like me when I'm angry!" thus pretty much ending the Civil War in one fit of irritation?
2. Doctor Strange Featuring...Scarlet Witch
Another fairly obvious one, this, but since Scarlet Witch's powers seem to have a distinctly mystical tone to them, could we see her turn up at some point in Doctor Strange's first solo adventure? It might make more sense as a future plot-teasing post-credits scene, but that doesn't make the potential teaming of Benedict Cumberbatch and Elizabeth Olsen any less appealing.
Especially if we get to see some kind of magical training montage.
3. Guardians of the Galaxy Vol. 2 Featuring...The Vision
Now, if there's one Marvel movie that's unlikely to feature a cameo from an already established Earth-bound hero, it's Guardians Vol. 2 - but that doesn't mean it's impossible.
After all, if there's anyone who's liable to fly off into space at the end of Captain America: Civil War, it's The Vision - and watching him deal with Drax and Groot could be comedy gold.
4. Marvel's Spider-Man Featuring...Iron Man
Now, I'm still holding on hope for this being our first chance to see Daredevil on the big screen - but the most likely cameo candidate for Sony and Marvel's (well, Kevin Feige's) first joint foray into solo movie-dom? Tony 'Iron Man' Stark himself.
After all, if you were Sony, negotiating that Spider-Man/MCU deal, who would you want cameo-ing in your movie? Robert 'Box-Office-Gold-When-Playing-Iron Man' Downey Jr., or literally anyone else?
5. Thor: Ragnarok Featuring...Doctor Strange
With not a whole lot of movie minutes available between now and Avengers: Infinity War - and a handful of very 'solo' looking standalone adventures arriving in the meantime - there's a pretty solid chance we'll see the likes of Doctor Strange turn up where you might not expect.
An impromptu means of getting to Asgard for Thor, perhaps, after he's shut out by Loki? It'd be worth it just to watch Cumberbatch and Tom Hiddleston match wits...
6. Avengers: Infinity War Pt. 1 Featuring...The Guardians of the Galaxy
There've been murmurings to the contrary, but if there were ever a time to introduce the Guardians of the Galaxy to the rest of the MCU, it's surely Avengers: Infinity War. After all, surely they're the best qualified heroes around to competently battle Thanos?
A surprise appearance to save the day - or to pick up the pieces after a crushing defeat at the hands of the mad Titan - at the end of Part 1, perhaps?
7. Black Panther Featuring...The Winter Soldier
One of the most intriguing rumors to float around the imminent arrival of the Black Panther in the MCU is the idea that The Winter Soldier may have had something to do with either the death of his father, or some other key (and presumably infamous) moment in Wakandan history.
If so, teaming up Black Panther and Bucky could make for some seriously entertaining fireworks...and a perfect set-up for Bucky to eventually take over as a certain Star-Spangled Avenger.
8. Captain Marvel Featuring...War Machine
Now, Carol Danvers and James 'Rhodey' Rhodes have recently had something of a thing in the Marvel comic book universe, but whether or not romance was in the cards in the MCU, the pair would make for a natural pairing on screen.
Their shared military background - and experience flying around blowing stuff up - could make Don Cheadle's Rhodey the perfect mentor/foil for the newly empowered Captain Marvel. Plus, there's not likely to be another Iron Man solo movie for a while yet, so it'd be nice for War Machine to have something to do...
9. Avengers: Infinity War Pt. 2 Featuring...Everyone
There is actually a distinct possibility that Avengers: Infinity War will, over the course of its two parts, feature every single hero we've ever seen in the MCU.
Which, on the one hand, means speculating as to who'll cameo is completely redundant, but, on the other, would/will be AWESOME.
10. Inhumans Featuring...Quicksilver?
Yup. That's right.
The events of Avengers: Age of Ultron may have made this seem about as likely as a Batman v Hawkeye crossover movie (which, incidentally, someone should totally make), but that doesn't mean it's completely off the table.
With the consequences of Infinity War yet to be anywhere close to apparent, Aaron Taylor-Johnson being heavily rumored to have a contract extension pre-signed somewhere, and Quicksilver having a whole lot of comic book history with Inhumans (he married an Inhuman princess, after all), this one would be a shocker - but it could happen.
A conclusion to a Phase 3-long quest by the Scarlet Witch to bring her brother back, perhaps?
The big question, though?