Marvel generally runs an airtight ship, as evidenced this past weekend at the 2013 Comic-Con. The studio managed to keep a lid on the title for Joss Whedon’s Avengers sequel ahead of time, whereas WB/DC’s plans for a Superman/Batman team-up movie leaked a few hours ahead of the “surprise” announcement at the ‘Con. However, there is one secret that keeps threatening to break from from Marvel’s grasp prematurely (re: before the official studio announcement): the identity of the resident of the Marvel Cinematic Universe whom Vin Diesel is up to portray.

Diesel let it slip at the Universal Comic-Con panel – where he was promoting the upcoming Riddick – that an announcement about his Marvel character is due to drop before this month draws to a close. The actor had offered another teaser on the subject, which should only continue to fan the most popular theories about who he is up to portray.

EW sat down to interview Diesel, alongside his Riddick costar Katee Sackhoff (a.k.a. Starbuck on Battlestar Galactica) and writer-director David Twohy. The site pressed him for more information on the Marvel casting, and it didn’t take much coaxing for Vin to offer the following:

“Marvel was excited about bring a different kind of relationship, a different kind of love story, I guess kind of semi-inspired from the Dom-Letty relationship, into the Marvel universe.”

Dom and Letty, of course, are the character played by Vin Diesel and Michelle Rodriguez in the Fast and the Furious movies. The most recent installment, Fast & Furious 6 (a.k.a. Furious 6), featured a storyline where Dom had to rekindle their romantic flame, since Letty had suffered memory loss due to the events in Fast & Furious. That meant Dom not only needed to re-win Letty’s heart, but also prove his devotion to her (that included saving her life by jumping out a vehicle that was probably moving at over 100 mph at the time).

There are two popular theories about who Diesel is playing in the MCU:

  1. Thanos, as glimpsed during the Avengers‘ button (re: mid-credits) scene. His infamous courtship of the character Death – an entity who embodies the end of life in the Marvel universe (often appearing in the form of a human female) – was teased during the Mad Titan’s brief appearance onscreen in Whedon’s film.
  2. Vision, the android created by Ultron, who we now know is going to be featured in the Avengers sequel. Furthermore, Vision’s love interest/wife is Scarlet Witch, who is another confirmed character that will be introduced in Avengers: Age of Ultron.

Whedon has teased his plans to tweak Ultron’s origins in his Avengers sequel, which could be a sign that Vision is going to show up at some point. However, the relationship between Thanos and Death seems closer to the Dom-Letty dynamic (well, relatively speaking); as opposed to, the Vision-Scarlet Witch romance, with Diesel as the former and a version of S.W. who will be young enough to bear a resemblance to Saoirse Ronan.

Then again, Diesel posted a picture of Vision as his profile image on Facebook last year (before quickly taking it down). Interpret that as you will.

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Arguably, Diesel seems like a better fit for Thanos, in terms of his build and growly voice; though, some might counter by pointing out that those traits also make him a good match for Vision. As more food for thought: the potential timing of a casting announcement for Diesel suggests he will play a role in Guardians of the Galaxy (a movie that is confirmed to include Thanos), which he might then be able to reprise in Avengers: Age of Ultron.

Then again, maybe Diesel is going to voice Rocket Racoon in Guardians, and the “different kind of love story” that he mentioned is that between R.R. and Groot the humanoid tree (hey, we wouldn’t put anything past director James Gunn).

Let us know who you think Vin Diesel will (or, rather, ought) play in the MCU in the comments section!

Iron Man 3 releases on DVD and Blu-ray on September 24th, 2013.

Meanwhile, Thor: The Dark World opens in theaters on November 8th, 2013, followed by Captain America: The Winter Soldier on April 4th, 2014, Guardians of the Galaxy on August 1st, 2014Avengers: Age of Ultron on May 1st, 2015, Ant-Man on November 6th, 2015, and unannounced films for May 6th, 2016, July 8th, 2016 and May 5th, 2017.

Source: EW