One of the Marvel Cinematic Universe's biggest strengths is its inter-connectivity. One movie affects another - and while traditional sequels have existed for decades, nothing like the MCU has ever really been attempted. Obviously, it's worked out well for Marvel: their movies are consistently some of the highest-grossing films of the year, and the studio isn't slowing down anytime soon.

For the most part, the connections between the movies have been relatively simple: Captain America movies may feature a cameo from Tony Stark, while an Iron Man movie may feature Mark Ruffalo's take on Bruce Banner. With Phase 3 set to kick off with next year's Captain America: Civil War, fans are expecting more inter-universe connections than ever...but one of these connections may have been spoiled ahead of schedule.

As Doctor Strange heads into production, it only makes sense to see more of the cast and crew popping up on Twitter...but few would have expected to see Tom Holland - a.k.a. the new Spider-Man - appearing in said production photos.

So, what exactly does this mean? Well, at this point...nothing.

While it is strange (no pun intended) to see Spider-Man pop up on a set that isn't his own, there's not necessarily any reason to think he'll be appearing in Doctor Strange. Holland's random cameo does certainly seem suspicious, and Spidey has teamed up with the Doctor on more than one occasion...but there's a good chance that Marvel would have pulled the photo down if there was anything truly spoiler-ish about it.

That being said, both Doctor Strange and Spider-Man are set to debut next year - could it be that Marvel is planning a second adventure for the web-slinger before his own solo movie debuts?

If you haven't already heard, everyone's favorite neighborhood wall-crawler is set to make his first official MCU appearance in Captain America: Civil War, which debuts on May 6, 2016.

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