I was wrong. Not about me. About you. You've done what I could never do: You've united mutantkind and provided us a safe haven and a common purpose. You made it happen. Except it's suddenly not so safe. We've only just come into being, yet it may all be gone by this time tomorrow. Unless you make your first big decision as our leader a good one. 
Appearing in 1st story
Featured Characters:
- Professor X (Charles Xavier) (Main story and flashback)
- Cyclops (Scott Summers) (Main story and flashback)
Supporting Characters:
- X-Men (Main story and flashback)
- Angel (Warren Worthington III) (Main story and flashback)
- Emma Frost
- Kitty Pryde
- Magneto (Erik Lehnsherr) (Main story and flashback)
- Namor
- Colossus (Piotr Rasputin) (Main story and flashback)
- Wolverine (Logan) (Main story and flashback)
- Rogue (Anna Marie)
- Marvel Girl (Jean Grey) (Only in flashback)
- Beast (Hank McCoy) (Only in flashback)
- Iceman (Bobby Drake) (Only in flashback)
- Havok (Alex Summers) (Only in flashback)
- Nightcrawler (Kurt Wagner) (Only in flashback)
- Banshee (Sean Cassidy) (Only in flashback)
- Polaris (Lorna Dane) (Only in flashback)
- Phoenix (Only in flashback)
- Storm (Ororo Munroe) (Only in flashback)
- Dr. Nemesis (James Bradley)
- God (Yahweh) (Invoked)
Other Characters:
- unnamed Indian doctor
- Jono Starsmore (Only in recap)
- Cable (Nathan Summers) (Only in recap)
- Hope Summers (Only in recap)
- Krakoa (Mentioned)
Races and Species:
- Mutants
- Atlantean-Human Hybrids
- Abstract Entities (Only in flashback)
- Humans (Only in flashback)
- Krakoas (Mentioned)
Locations:
- Earth (Main story and flashback)
- United States of America (Main story and flashback)
- California (Main story and flashback)
- San Francisco (Only in flashback)
- Golden Gate Bridge (Only in flashback)
- San Francisco Bay
- San Francisco (Only in flashback)
- New York (Only in flashback)
- Westchester County (Only in flashback)
- Salem Center (Only in flashback)
- Xavier's School for Gifted Youngsters (Only in flashback)
- Salem Center (Only in flashback)
- Westchester County (Only in flashback)
- California (Main story and flashback)
- India (Only in flashback)
- United States of America (Main story and flashback)
Items:
- Cyclops' Visor (Main story and flashback)
- Magneto's Helmet (Main story and flashback)
- Wolverine's Suit (Main story and flashback)
- X-Uniforms (Main story and flashback)
- Ruby-Quartz Sunglasses (Only in flashback)
Vehicles:
- X-Men Blackbird (Only in flashback)
Synopsis for 1st story
- Synopsis not yet written
Solicit Synopsis
Before Messiah Complex came Endangered Species. This is the prelude to the X-Men Event of 2011. What does it mean to be a leader? What does it do to a person? What do the choices you make mean about the person you are? This mini-series delves into these issues and will give an X-Men reader what they need to know about their favorite mutants before everything changes in July.