You know how many advertisements for movies say how “everything has led to this” from time to time? Well, for once, this statement makes perfect sense with “Avengers: Infinity War” which is, thus far, the biggest Marvel Cinematic Universe movie yet as it gives us their most threatening foe yet in Thanos. This particular Marvel character, an intergalactic despot from the planet Titan, has been hinted at in post-credit sequences from Marvel movies past, and now he is here to take center stage in a never-ending franchise which typically sees its greatest heroes get the majority of attention.

Thanos longs to get his hands on the Infinity Stones, six incredibly powerful, not to mention beautiful, gems which will allow him to impose his will on all of reality. Clearly, this is a character determined to gain unlimited power at any cost, and he is determined to re-balance the universe in the process. Thanos is looking to create his own version of Year Zero, and this means many characters will die whether we want them to or not.

Not only does “Avengers: Infinity War” arrive with a wealth of anticipation and expectations, but we also come into it with a sense of dread as we know some of our favorite characters may not survive this particular adventure. Then again, these Marvel movies do exist within the science fiction genre, and you can never be sure if anyone can ever truly stay dead. Spock died in “Star Trek II,” but he did come back to life in “Star Trek III.” Knowing “Avengers: Infinity War” will get a sequel, I can’t help but believe we will see some of these superheroes again. Besides, many of them have sequels in pre-production, so their fate is not exactly sealed. Who will live and die for certain? Well, we will find this out in the summer of 2019.

Directors Anthony and Joe Russo, both responsible for the “Captain America” sequels which rank among the best of the MCU, have a near impossible task with this “Avengers” movie as it features dozens upon dozens of main characters we have been introduced to in the past. The fact these characters are not all equally represented here is not a surprise, but what surprised me was how well the Russos were able to balance things out to where it felt like everyone had a good dose of representation throughout. Perhaps certain characters get more screen time than others, but I was too wrapped up with what was going on to really analyze this movie all too closely.

It is also worth noting how while these characters all inhabit the same cinematic universe, they do exist on different tonal levels. Some Marvel movies like “Iron Man” and “Thor” have their moments of levity, but they are generally serious adventures as their heroes are faced with obstacles both physical and psychological. Then again, there is “Guardians of the Galaxy” which came out at a time where Marvel movies in general were threatening to become as deadly serious as anything coming out of the DC Comics Extended Universe. James Gunn’s film of Peter Quill and his merry band of Han Solo-like bandits proved to be a comedic blast from start to finish, and it proved to be much lighter than the average superhero/comic book movie.

I bring this up because “Avengers: Infinity War” could have ended up being a very uneven motion picture in terms of tone as John Krasinski’s “The Hollars” was (granted, Krasinski did score a rebound with “A Quiet Place,” but still). The Russos, however, make everything blend together in a satisfying way to where nothing felt completely off-balance, and this is very commendable.

The way I see it “Avengers: Infinity War” gets off to a good start, but things feel just a little bit off to where this movie threatens to be more episodic than its filmmakers intended. But as it goes on, things improve to where the Avengers are given a real depth which reminds us they are as vulnerable as anyone else. Sure, they may be endowed with tremendous powers, but when faced with their greatest foe, they become as mortal as anyone else, and this makes their latest adventure all the more perilous.

There are many performances worth noting here, and this Marvel movie is overflowing with strong ones which would take forever to point out. Robert Downey Jr. continues to revel in the evolution Tony Stark/Iron Man as he gives his most soulful performance yet as this iconic comic character which got the MCU off to such a strong start. Zoe Saldana gets to take Gamora to an even more epic level as her character has a much closer relationship to Thanos than she would like to admit. The same goes for Chris Pratt who, as Peter Quill/Star Lord, finds even more depth than in the previous “Guardians of the Galaxy” movies to where it makes me look forward to the third movie in that franchise more than ever before.

But the one performance worth singling out above all others is Josh Brolin’s as Thanos. This could have been the typical one-dimensional antagonist bent on obtaining the most power any individual could ever obtain, but the “No Country for Old Men” actor makes him into an almost tragic figure who has yet to discover what price he has to pay for his quest for power, and it is a heavier one than he could ever expected. As a result, Brolin forces this character into the center stage in a way audiences could not have easily expected, and the final scene he has is a frightening reminder of the prominence Thanos has in the realm of Marvel Comics. Seeing this makes me believe no other actor could have portrayed Thanos as effectively as Brolin does here.

“Avengers: Infinity War” ends on a cliffhanger, and it feels like a bold move on the part of the Russo brothers and Marvel Studios to do so as it concludes on a note which truly left me breathless. We do get the typical post-credits sequence and the message of how so-and-so will return, but both these things take on a different meaning to where you almost wish this Marvel movie ended without them. In a year from now we will see the follow up to “Infinity War,” but until then we will be reminded of how our heroes will not always be there for us. Can they return for another round? We have yet to find out.

* * * ½ out of * * * *