Earlier this week, Marvel's massive blockbuster Avengers: Age of Ultron debuted on Digital HD formats, before arriving on Blu-ray 3D, Blu-ray and DVD on October 2. Now that fans have the opportunity to scour through the film, frame-by-frame, it shouldn't be surprising that a new Easter Egg has surfaced. Reddit user Kalean speculated months ago that one of the A.I. chips Tony Stark (Robert Downey Jr.) uses for Ultron is labeled "Tadashi," which is most likely a reference to Tadashi Hamada, Hiro Hamada's big brother in Disney's hit animated movie Big Hero 6.

Big Hero 6 is actually the first big-screen animated adaptation of a Marvel comic book, albeit a very obscure one. Big Hero 6 was created by Steven T. Seagle and Duncan Rouleau in 1998, debuting in a three-issue mini-series. The characters later came back for five separate mini-series that launched in 2008, but it still is one of Marvel's most obscure comic titles. The animated movie adaptation performed quite well at the box office, taking in $657 million worldwide ($222 million domestic) from a $165 million budget.

Avengers: Age of Ultron was still in production when the first trailers for Big Hero 6 debuted, so it's possible that Joss Whedon decided to give a tiny nod to the animated movie. As it turns out, there is also a second Easter Egg, with another AI chip labeled Jocasta. In the comics, Jocasta was a sentient robot created by Ultron, by stealing the brain patterns from Janet Van Dyne. Jocasta was created to be Ultron's bride in the comics, but, we likely won't see Jocasta on the big screen anytime soon, at least not as Ultron's wife.

Marvel's Avengers: Age of Ultron stars Robert Downey Jr., who returns as Iron Man, along with Chris Evans as Captain America, Chris Hemsworth as Thor and Mark Ruffalo as The Hulk. Together with Scarlett Johansson as Black Widow and Jeremy Renner as Hawkeye, and with the additional support of Samuel L. Jackson as Nick Fury and Cobie Smulders as Agent Maria Hill, the team must reassemble to defeat James Spader as Ultron, a terrifying technological villain hell-bent on human extinction. Along the way, they confront two mysterious and powerful newcomers, Wanda Maximoff, played by Elizabeth Olsen, and Pietro Maximoff, played byAaron Taylor-Johnson, and meet an old friend in a new form when Paul Bettany becomes Vision.

It remains to be seen how many more Easter Eggs will be discovered, now that this hit sequel is available on Digital HD. Unfortunately, the Digital HD, Blu-ray 3D, Blu-ray and DVD will not feature a director's cut, as confirmed by Joss Whedon. While we wait for news on more Easter Eggs, check out this screengrab from Kalean below from Avengers: Age of Ultron.

Avengers Age of Ultron Screengrab