In "Big Hero 6," it was shown how Hiro looked up to his big brother, Tadashi, who died an unfortunate death and left the little brother to continue on his legacy. But is Tadashi really dead? Rumors say no.

It was already hinted by Stan Lee himself in a report from Toronto Sun that a "Big Hero 6" sequel will happen.

Ever since Lee's announcement, rumors started to circulate online and most of them point to the possibility that Tadashi is alive.

According to reports, Tadashi would make a comeback as Sunfire, a member of the Marvel Universe superhero team.

But Tadashi's comeback won't be a sweet one, because it is believed that he will be a "possessed" villain first, with the possibility of fighting with Hiro, who clearly missed him.

Movie Pilot's Jon Negroni was the one of the firsts to speculate on the plot of "Big Hero 7."

Sunfire is an original member of the team and has a power that absorbs heat and converts it into plasma.

If Tadashi is really alive for the next movie, it remains uncertain whether he'll be a villain or one of the good guys.

A sequel to "Big Hero 6" is not really surprising especially since the first movie was a box-office hit. IGN reported that the movie was dubbed as the highest grossing animated film last year.

A sequel to the movie has not been confirmed; no release date yet and even directors Don Hall and Chris Williams said that they have not talked about making a sequel.

However, fans are anticipating for a sequel, and pushing for its release any time soon. After all, Baymax won over the hearts of many.

Lee hinted that a "Big Hero 6" sequel will come after "Guardians of the Galaxy 2," so if that's the case, the animated superhero movie will be released sometime in 2017 or 2018.