X-Men: First Class 1;

For millions of years, mankind's place on Earth was unchallenged - until five young people paved the way for a new kind of human! While students at the Xavier School for Gifted Youngsters, Cyclops, Marvel Girl, Angel, Beast and Iceman taught the world what it meant to be X-Men. These are the hidden stories of the team that laid the foundation of a mutant dynasty!

Collecting:

X-Men: First Class (2005) #1, #2, #4, #5, #7; 2007 Special (Kevin Nowlan story )