MARVEL HAS SAID not to look too deeply into how serious the first trailer was for “Iron Man 3,” emphasizing that this will be a fun film to hit the trilogy mark with.

After seeing the latest “IM3” trailer that hit the Interwebs on Tuesday, though, this looks like an extremely intense movie.

For fans who knew Iron Man long before Robert Downey Jr. suited up, it’s thrilling to see elements from some of his greatest comic-book scenes brought into the film — especially Extremis and the presence of the Mandarin (Ben Kingsley) and the Iron Patriot (Don Cheadle).

Also affirming in the trailer: It’s a joy to watch the Iron Man suit connect to Tony, at any time, at will. And speaking of strong attachments: The Tony/Pepper bond seems to be growing stronger. Although some viewers might prefer to see Tony the wild playboy (a la the comic-book Tony) — something reflected in the beginning of the first “Iron Man” film — Downey Jr. and Gwyneth Paltrow have great screen chemistry.

A new “IM” movie also means new armor, and though it’s a little too much gold — and not enough red — for my taste, Iron Man’s new rig is still impressive.

And possibly the biggest surprise — sagely saved for the end of the trailer — is the Iron Army that Tony seems to have built. Quite the arsenal when the bad guy seems intent on destroying your world, if not, well, the entire planet.

For those fans who thought “Iron Man 2” was a letdown, this trailer should strengthen hopes for the follow-up.

And though visually stunning, the words had a higher-than-usual impact in this trailer. For instance:

“So why can’t I sleep?”

Tony Stark

Let’s not forget that the cinematic Tony Stark/Iron Man just got done helping the Avengers save the world. And as we lose ourselves in the spectacle of saving the Earth from destruction by an alien race, we don’t necessarily think about what effect that can have on the human mind. The universe is a lot bigger than Tony imagined, which means his world and the people he loves (basically just Pepper Potts) aren’t as safe as they seem. Tony looks like a man with the weight of the world on his shoulders. Could Iron Man’s demon-bottle addiction emerge?

“I will defend this country at all costs.”

— The President

The homeland is under attack, and the United States isn’t taking any chances. Government leaders obviously don’t have Iron Man on speed-dial, or maybe they just don’t want to have to be able to depend on him. That becomes clear when the red, white and blue armor of the Iron Patriot is seen saluting the President as he boards Air Force One. Fanboys will know that in the Marvel comics, the Iron Patriot is Norman Osborn aka The Green Goblin of Spidey fame. But let’s not forget Sony still owns the rights to Spider-Man and his rogues, so for the Marvel Studios movie universe, the Iron Patriot is James “Rhodey” Rhodes, formerly War Machine and one of Tony’s best friends. Some viewers might not like such a broad jump from the comics in regards to the Iron Patriot, but for the tone of this movie, it could work very well.

“You don’t know who I am. You’ll never see me coming.”

— The Mandarin

That trouble on the homeland? Who’s behind it? None other than the classic Iron Man villain the Mandarin, portrayed intensely by Kingsley. From the massive destruction and explosions in the trailer, we can see the Mandarin is out to send a message to the world and take down Tony Stark at the same time (blowing up Tony’s mansion was a good start). There’s still a lot of mystery in terms of the Mandarin’s back story — and why does he have a Captain America tattoo on his neck? Are they connected? Let’s not forget Cap is really old. And the Mandarin flaunts his lack of regard for Iron Man when he tells Tony: “Today is the first day of what’s left of your life.”

“What are you going to do about these attacks?”

— A reporter, talking to Tony Stark

A lot of Tony’s insomnia and stress probably are caused by the fact that ever since he helped save the world, people are always looking for him pull an iron suit out of his briefcase and save the day. How much is Tony’s apparent anxiety going to affect him when it’s time be a superhero.

“I’m not afraid of you. No politics here. Just good, old-fashioned revenge.”

— Tony Stark

Whatever seems to have gotten a hold of Tony, it hasn’t taken away his will to punch back — and when Tony prepares for a counter-punch, we can expect epic.

Judging merely this trailer, “Iron Man 3” indeed will be.