RIP, Hugh Jackman's Wolverine.

The actor has spent the better part of two years promoting "Logan" as his #OneLastTime donning the claws and tank top. Gone are Wolverine's spandex and unique hair. Instead, our favorite X-Men is rocking a grey beard and grey hair as he embarks on his darkest and most violent adventure yet.

Director and co-writer James Mangold set out to deliver a definitive and R-rated comic book movie for adults. One that makes it hard to let go of Jackman's iconic take on the character. There are a lot of good-to-great beats in "Logan." These five make it the hardest to say goodbye. And even harder for whomever picks up the claws from here.

"Logan" is largely a character-first western that happens to be a Wolverine movie. It's about the cost that saving the world has on the very tortured man trying to defend it. A man who has killed more people than he's had hot meals, a man who sees every one of those deaths in his sleep and wakes up forced to live with that blood on his hands.

The movie double-downs on what this all means for our weary hero -- he drinks constantly to numb the pain that his broken healing factor no longer can, he clings to the belief that he "sucks" at caring about people because "bad sh**" happens to all the people worthy of his care. This manifests dramatically in key scenes between Logan and Charles/Professor X, as the latter -- despite suffering from the mutant equivalent of ALS -- reminds Logan the importance of family. That the tragic hero still has time to give himself (at least) a sense of a life worth living -- he just has to slash through a bunch of bodies first.

In between all the claw-happy set pieces and violence, "Logan" delivers a resonate meditation on what it takes to be a hero. Sometimes, it does so by pulling on the heartstrings in ways that make your eyes leak tears the way Wolverine's hands pop claws.

Of all the Wolverine films, "Logan" comes closest to being the best.

Maybe 15 minutes in, we've heard Charles say the word "fu**" or its derivative several times. That's worth the price of admission, but "Logan" has more in store for the X-Men's caretaker and father figure. They actually give him -- and the actor -- new and challenging things to play as a 90-year-old mutant burdened with the most dangerous brain and mutation on the planet. His condition manifests in the form of psychic seizures. Remember how Professor X stops time in the first two X-Men films? Okay, so, his seizures are like that -- only the more violent version of that. So violent, they end up coming scary-close to putting the people Charles has sworn to protect in comas -- or, as we latter learn, in the grave.

Sadly, time runs out for Charles at the hands claws of a surprise assailant. (The reveal of which is better left for seeing in theaters). Yes, Xavier dies. Worse, he's murdered. And even worse, he dies before he can get to the tranquil life on the ocean Logan's been saving up and chasing down for him. Before he can see whether or not Logan takes his aforementioned poignant, haunting advice. This movie is dripping with tragedy, and only a pro like Stewart knows the exact amount to give that story so it can be told effectively -- and emotionally.

"Logan's" hack and slash approach to action grows repetitive -- you can only come up with so many new ways to stab skulls. At the same time, it's done at times in a very minimalistic way -- no wire-fu, like in previous "X-Men" films. It all builds to a mostly satisfying oner, with Wolverine going full "Berserker Rage" to deliver wants fans have waited nearly 20 years to see.

Huge chunks of her screentime are spent silently observing and reacting to things, and Keen excels with her intentionally minimalist work. But the real revelation comes toward the film's third act, when she finally speaks -- and punches Logan in the face. Keen's performance gets increasingly complex as the story demands X-23 shed some tears in battle, in a scene the gives the young actor a chance to (mostly) hold her own opposite a veteran like Jackman.

An effort that hopefully sends them back in for a second viewing.