"Anything goes in this free-for-all locale."
—Heroes and Heralds Mode description
Danger Room is one of the stages in X-Men: Children of the Atom, which is the stage of Cyclops and Akuma. This stage is located in the southeast part of America, inside Xavier's "School for Gifted Youngsters". This room was created by Professor Charles Xavier to train his X-Men, containing several training devices and holographic programs.
Professor Charles Xavier is the founder of the X-Men. He can be seen in the background of the stage, supervising the "training" from a window. Besides the Danger Room stage, Professor X also has other appearances in the series, appearing unconscious after Onslaught's defeat in Marvel vs. Capcom, in some character endings, and as a card in the Heroes & Heralds mode.