WARNING, SPOILERS FOR X-MEN: DAYS OF FUTURE PAST AHEAD (obviously)
Though it was a fun, thoroughly entertaining X-Men flick, DoFP was a confusing movie, guys. So much so, it took me a full day to gather my thoughts and create this checklist of mutant cameos.
If you haven't seen the film, PLEASE check it out before reading on! You can also read my full (spoiler-free) review if you're on the fence.
It's important to note that some of these were pretty obvious, but I'm listing them anyway for casual fans who don't read the comics or keep up with all of the movies.
#1 Blink, Warpath, Sunspot and Bishop
Let's start with our first bunch of new mutants that opened the movie. You probably recognized Iceman, Colossus and Kitty Pryde from "The Last Stand," but these were the "new" mutants that helped them dodge those tricky sentinels in the dark future.
Blink was the girl who could create teleportation portals, Warpath was the sensory mutant who was able to detect incoming sentinels, Sunspot was the Human Torch-like hothead and Bishop was the guy who absorbed others' powers for his gun.
You may also be wondering if those sentinels are connected to the Destroyer in the first Thor movie, by any chance. After all, their design is similar enough to warrant a lawsuit, but there's no clear connection to them in the Marvel comics (as far as I know).
#2 Ink, Havok, Spyke and Toad
Later in the film, Mystique liberates a few mutants in Vietnam who are being used for the war effort. Havok (Alex Summers) is a familiar face from "First Class," though we don't know for sure yet if he's the brother of Scott Summers (Cyclops) or related in a different way that deviates from the comics.
Ink was the mutant with the tattoos, which each have different powers. Spyke is a character that was first introduced in the animated series, "X-Men: Evolution," and he made a brief (albeit terrible) appearance in "The Last Stand."
Finally, we were introduced to an awesome-looking Toad. You may recall that Toad was killed by Storm in the first X-Men film back in 2000, and it actually took longer than 10 seconds.
#3 Magda, Quicksilver and (Maybe) Polaris
In order to save Magneto, Logan and Xavier recruit the super-fast Quicksilver, who is just a minor in this film. Logan knows the older version of Quicksilver, possibly because it is revealed later on that he's the son of Magneto.
Now, this next part is tricky because Quicksilver's real name is Pietro (Peter) Maximoff, which is clearly shown on the mailbox outside of their home. In the comics, however, Peter and his twin sister Wanda (Scarlet Witch) were born to a woman named Magda Eisenhardt (her given name for marrying Max Eisenhardt, which is Magneto's real name before it was Erik).
This may confirm that we're seeing Magda Maximoff (her maiden name) as his mother, though she is supposed to be a gypsy in the comics. If that's the case, then we may be able to assume that the little girl she calls Peter's "sister" is Lorna Dane (Polaris), Magneto's child with another woman. It's a bit of a stretch, but definitely possible.
#4 Bryan Singer, Chris Claremont and Len Wein
If you look closely, you'll see Bryan Singer in the crowd when Magneto is pulling Mystique toward him after shooting her. You'll also see Mystique transform into a man played by Chris Claremont, the man who wrote the original story for "Days of Future Past" back in the 80s. Additionally, Len Wein (the creator of Wolverine, Storm, Colossus and Nightcrawler) makes an appearance, as well.
#5 Angel, Banshee, Azazel and Emma Frost
Sadly, these mutants are only mentioned in passing by Magneto, who states that they have all died since "First Class." You can also see some of them, along with other mutants, on the photos of dead mutants that Mystique is sifting through in Trask's office.
#6 William and Jason Stryker
This was another obvious cameo that turned a lot of heads...for several reasons. First, this version of Stryker was much younger than the Stryker we met in 1975 during X-Men Origins: Wolverine. DoFP takes place in 1973, two years before Wolverine and Sabretooth are recruited by Stryker, but it's never explained why the two mutants (who were fighting the war together) were apart when Wolverine awoke in that hotel room in New York.
Stryker also mentions his son, Jason, who is 10 years old. That about matches up with the adult version of Jason who is seen in X2.
#7 Shadowcat and Colossus
During the final moments of the film, we see the "new" future of Xavier's school. Among the students are Iceman and Rogue, who are now back together (thus rewriting "The Last Stand").
More interestingly, you can see that Kitty Pryde and Colossus are a couple now, which was never hinted at in the movies, though it was very prominent in the comics.
#8 Jean Grey, Cyclops and Beast
The biggest crowd-pleaser of the movie was seeing Jean Grey and Cyclops reborn after being killed off in "The Last Stand." Not only that, but the movie also confirmed that Beast is alive and now back at the school (Wolverine told the young Beast earlier that he didn't survive the onslaught of the sentinels).
Of course, it was honestly great to see Kelsey Grammar, Famke Janssen and James Marsden reprise their roles almost a decade later (and they seemed happy to do it).
This is unconfirmed, but many people claim that one of the mutants seen in the very beginning of the film is missing an eye and is therefore Cable. I'm not sure if that's valid, so I'll be re-watching the film before becoming an evangelist on that theory.
#10 Apocalypse and the Four Horsemen
We can't forget the post-credits sequence, which teased the arrival of the next film's big bad, Apocalypse. Rumor has it, however, that the actor we see in that scene won't be reprising his role.
During the sequence, the crowd is chanting his real name, "En Sabah Nur," and his Four Horsemen (War, Famine, Pestilence and Death) are at his side. We do not, however, see Ozymandias, who is his immortal slave and right-hand man.