SAN DIEGO — Vin Diesel surrendered to MTV's questions about his Marvel meeting, while artfully avoiding any specific confirmations. He demonstrated that cool, gravely laugh, cautiously treading into top-secret territory at Comic-Con on Friday (July 19).

The last time Diesel came to SDCC, he was promoting a little movie called "Pitch Black." Thirteen years later, he returned to unleash some killer red-band footage from to a vocal Hall H crowd. While the in-depth look at Diesel's third cinematic turn as the goggle-wearing outer space badass was supercool, Twitter feeds were abuzz after he let slip a little Marvel Universe tidbit. "There is some very big news coming at the end of this month," he teased.

Well, that certainly did little to quell the rampant speculation and excitement he ignited a short while ago when he took to social media to post about his mysterious meeting with Marvel. While he was ostensibly talking with MTV News to promote his R-rated return to the "Riddick" universe, the big super-powered elephant in the room was too big to ignore.

The big, super-powered green and yellow "elephant."

"Oh God, Oh God. Wow. Uh... Hmm, uh..." he stuttered at the mention of the "M" word.

"Well, [to discuss it] in theory," he began, cautiously. "I didn't know there were over eight-thousand characters in their library. Did you? Did you?! Eight-thousand characters! They were saying, 'You know, Vin, we have eight-thousand characters...' "

So, did they open up a book and say, "Which one do you want?"

"No!" he said, laughing. "I mean, ya' know, I hope there's more thought ...

PHILADELPHIA — Earlier this week, rumors spread that "X Factor" mentor Demi Lovato allegedly took aim at fellow pop star Justin Bieber during an audition stop at USC, saying, "Well, finally someone can sing the song the way it was meant to be sung," after a male contestant sang Bieber's hit "As Long as You Love Me."

But when MTV News recently caught up with Lovato, she gave us the complete story.

"What they didn't put in the tabloids is that I actually turned around 'cause the audience was like, 'Oooh' and I was like 'Actually, guys, you took me the wrong way,' " Lovato said at the Pop-Tarts Crazy Good Summer Concert in Philadelphia. "I actually explained myself right then and there, but they didn't put that on TMZ."

Shortly after the reports surfaced, Lovato, who is nominated for a 2013 VMA for "Best Female Video," was quick to fire back, taking to her Twitter account to defend and clarify her remarks.

"Btw - no shade thrown at Justin. So many people audition with his songs.. Finally someone sang it the way it was meant to be sung.." she tweeted before adding, "Meaning, finally someone sang it the way JUSTIN sang it."

Even though Lovato meant no harm by what was said, she reveals that she will now do her best to make sure that her comments do not get misconstrued.

"It is annoying, but it is what it is," Lovato said. "I have to be more careful with the way that I word things, but I was home ...

BRONX, New York -- Sure, pairing Jay Z and Justin Timberlake for a big-time tour is great for business, but outside of the two collaborations that they share, how much chemistry could the two stars actually exhibit on stage? Apparently, a ton!

After kicking off their Legends of the Summer tour on Wednesday in Toronto, Canada, JT and Jay Z tag-teamed to thrill the sold-out crowd at New York's Yankee Stadium on Friday night. Shortly before 9:30 p.m., the pair took the stage to the tune of Jay Z's newly-released "Holy Grail." "You take the clothes off my back, and I let you," Timberlake sang atop the dinging piano keys as he and Jay emerged from different sides of the stadium only to meet at the center of the stage by the time the song's drums dropped.

Check Out Photos From Friday's Legends Of Summer Show.

When Hov and Kanye West went out together on 2011's Watch the Throne Tour they shared equal footing, performing mostly together, but at times enjoying solo spotlights for brief periods of time. It worked because The Throne, as they were billed, had an album's worth of material to perform. Justin and Jay had to get a little more creative however, and blend their catalogues together.

After "Holy Grail," Jay reached back and dusted off 2000's "I Just Wanna Love U (Give It 2 Me)," the first song he ever recorded with the Neptunes. Instead of Pharrell, Justin held down the hook while Jay spit his Notorious B.I.G.-inspired verses. Before the song ended however, the band (Justin's ...

SAN DIEGO — The Sony panel in Hall H on Friday (July 19) ran the gamut of your typical Comic-Con genres. It started with animation before moving to YA adaptation, a sci-fi action flick, and a superhero movie. Check out the highlights!

"The Amazing Spider-Man 2"
Photos of Spider-Man and Electro have covered San Diego for the past few days, amping up buzz around the sequel, and once the cast took the stage, the excitement was nearly electric. But there were a few people missing: Andrew Garfield, Emma Stone, and Jamie Foxx were nowhere to be found.

As a stand-in for Garfield, the crowd was treated to a very special consolation prize: Spider-Man himself. The wall-crawler snuck into the hall at the last minute and sounded surprisingly like Garfield. Spider-Man then took a seat at the head table and awaited the others. Emma Stone couldn't make it due to her filming schedule, which has her out of country, but she sent a video message. "She's hot," Spider-Man said.

Jamie Foxx then walked out to Kanye West's "Power," and Spider-Man was slightly star struck. "I love

An extended sizzle reel gave the fans a first look at mostly unfinished footage, including a look at the origin of Electro, who falls into a vat of electric eels. The reboot's humor was once again present with a lot of focus still on the relationship between Peter Parker and Gwen Stacy. The crowd also got its first look at a sickly Norman Osborn, as played by Chris Cooper, as well as Paul Giamatti as a comical ...

Jim Carrey may have publicly pulled his support of "Kick-Ass 2" in the wake of recent gun-violence tragedies, but that doesn't mean his co-stars have discounted the importance of his performance in the comic-book sequel.

"I was excited to work with Jim Carrey," Christopher Mintz-Plasse told MTV News during the San Diego Comic-Con live stream on Friday (July 19), after expressing similar excitement about playing a villain for the first time.

"His comedies in the '90s were the comedies that shaped my comedy," he continued, a short while after the "Kick-Ass 2" Hall H panel where fans shouted "McLovin'!" as soon as he emerged. " 'Dumb and Dumber.' 'The Truman Show...'"

Kick-Ass himself, Aaron Taylor-Johnson, spoke about what Carrey added to the flick, likening his intensity and commitment to what Nicolas Cage was doing as Hit-Girl's father in the original movie.

"That element that Nic brought in the first one is exactly what Jim brings to this one," he gushed, noting how much the new film needed that element. "These are really talented actors who create characters. Jim, he's done his look from the comic book. He brought all the prosthetics and everything. He loved the first one, that's why he came onboard."

Neither actor has had any communication with Carrey since the Tweets heard 'round the world where he said he would not be promoting the movie. "I sent 'J.C.' a little text," Mintz-Plasse joked. "I have no communication with him."

"It's sad he's not here," Taylor-Johnson said, as his co-star nodded his agreement. "He's so full of passion. He brings that energy ...

"It's going to get insane very quickly."

That's the head's up from showrunner Scott M. Gimple when it comes to the new season of And you might want to take "head's up" literally: AMC's zombie series is never afraid to let the blood flow, as illustrated by the new trailer debuted at Comic-Con.

During Friday's "Walking Dead" panel, the cast and crew unveiled a new trailer featuring a mix of familiar faces and new ones. Last season's newbies Tyreese (Chad L. Coleman) and his little sister Sasha (Sonequa Martin-Green) are now full-fledged members of the prison-dwelling group, fighting zombies alongside Norman Reedus' Daryl Dixon and Steven Yeun's Glenn through a shopping center. Indeed, the prison is healthily populated and organized -- at least until some mysterious party attacks floods a cellblock with walkers, killing many in the process: "twelve of our own," according to Hershel (Scott Wilson).

"Step outside, you risk your life. Take a drink of water, you risk your life," Hershel tells his fellow survivors at one point in the trailer, in between action shots of Tyreese hammering zombies and even turning his fists against Rick at one point. "You don't have a choice: the only thing you can choose is what you're risking it for."

The trailer concludes with Daryl, Tyreese, Michonne (Danai Gurira) and new character Bob Stookey (played by "The Wire" alum Lawrence Gillard) riding in a car together, shocked as a voice comes over the radio promising sanctuary.

"Those who arrive, survive," the voice promises.

Indeed, despite a peaceful beginning, it looks like season four will quickly ...

San Diego Comic-Con was dark and full of terrors on Friday afternoon, thanks to the "Game of Thrones" panel. Death was very much on the mind for Hall H attendees, as the panel began with an in memoriam video set to Boyz II Men's "Hard to Say Goodbye to Yesterday" -- an appropriate way to lead in to a conversation about season three's controversial Red Wedding episode.

Gone from the show but not from fandom, actors Richard Madden and Michelle Fairley were on hand to eulogize their "Game of Thrones" characters' deaths. And even with winter coming, Madden received quite the warm welcome, walking out to chants of "The King in the North! The King in the North!" Indeed, it was revealed that "The North Remembers" is a key phrase going into season four, premiering sometime in 2014.

"It was a rough day on set," co-showrunner David Benioff told the audience about killing Robb and Catelyn Stark (and countless others) in the penultimate episode of season three. "That was the last day we would work with them."

But it was even rougher on Madden, who cried on set and on his plane ride home over Robb's death. He acknowledged the "Game of Thrones"-sized hole that's currently in his life, making it clear that he very much misses the show.

Fairley, meanwhile, praised the "Rains of Castamere" theme, the musical cue that signals the beginning of the Red Wedding. "It was like someone walked over your grave," she said. Benioff added, "It's just one of those haunting things that's playing in my head right ...

A lot of voices have been heard this week in the wake of the Trayvon Martin case, including that of U.S. President Barack Obama, who made an unscheduled appearance in the White House briefing room Friday (July 19) to address the much-contested verdict.

Speaking about the verdict, which declared George Zimmerman last Saturday night of second-degree murder and manslaughter, Obama dove headfirst into some of the most personal thoughts on race he's offered up in all his years as president. Obama provided his explanation for why there has been so much turmoil within the African-American community over the case.

"You know, when Trayvon Martin was first shot, I said that this could have been my son," Obama said. "Another way of saying that is Trayvon Martin could have been me 35 years ago."

He then launched into a discussion of what it means to be African-American in this country and the racism that he himself has experienced in the past. "There are very few African-Americans who haven't had the experience of getting on an elevator and a woman clutching her purse nervously and holding her breath until she had a chance to get off," he said, a strikingly similar example to an anecdote Roots band leader Questlove offered up in a New York magazine story this week.

"And, you know ... I don't want to exaggerate this, but those sets of experiences inform how the African-American community interprets what happened one night in Florida," Obama said, adding that he thinks the country is improving when it comes to ...

SAN DIEGO— With Marvel turning almost every available superhero into a big screen action star, it's only a matter of time before we hear concrete plans for DC Comics to follow suit.

The comics company has successfully reestablished its two main heroes, Batman in Christopher Nolan's "The Dark Knight Trilogy" and Superman in Zack Snyder's "Man of Steel," but for a "Justice League" movie — possibly modeled off the "Avengers" formula — to work, more crime fighters from the pages of DC Comics will have to make their way to theaters.

During MTV's Comic-Con Live, host Steven Smith sat down with the Chief Creative Officer of DC Comics, Geoff Johns, to see what he thought about the big screen potential of a number of unused heroes. One in particular, Aquaman—who got the fictional movie treatment on the television show "Entourage"—is among the superheroes that Johns would love to see come alive.

"I'd love to see an Aquaman movie. I think he's a terrific character. People know him. The world is amazing," Johns said."Working with Ivan Reis on 'Aquaman' and later Paul Pelletier, the visuals are exciting. The characters are exciting. There are creatures. Ninety percent of the oceans have never been seen by human eyes. Most of our threats come from space, but I also think that having threats come from the deep sea would be great to see."

The success of "Man of Steel" almost guarantees a bigger cinematic universe from DC Comics, but as we saw with the failure of "Green Lantern," nothing is a sure bet.

Be sure to check back ...