According to Stan Lee, the Danger Room was created for the very first X-MEN comics issue by Jack Kirby (see Beast working out in it below), then given its official name in issue #2. So it has been around from the start (and preceeds by a decade the similar “Holodeck” used in later Star Trek incarnations, actually first seen the ST cartoon!). In X-MEN:TAS we used the Danger Room sparingly for a few reasons. First, action in real crises is always preferable to “training problems.” But more importantly, since the Danger Room can create spectacular but unreal dangers, it is tempting to trick the audience by creating big pretend fights or jeopardy (like in a character’s nightmare) which are then revealed to be “only projections” or dreams. We did allow ourselves the luxury of intense Danger Room imagery once, to great effect. That was in the episode (#14: “Till Death Due Us Part”) where Jean is about to marry Scott. Broken-hearted Wolverine takes out his unhappiness by obliterating some Scott-like projections, some of which end up looking like Scott-Sentinels (second image below). It provided a dramatic physical manifestation of Wolverine’s tortured inner struggle. By choosing not to overuse the Danger Room throughout the series, the few times we did it proved effective.