This strange new group of Mighty Avengers have finally found their first arch nemesis!

MC2 Brings On The Bad Guys: enter the Kree and the Sentry! After years of inactivity, the sinister Kree have returned to the MC2 Universe, and they've sent an invincible Sentry to spy on our planet! Now it's up to Thunderstrike, Mainframe, Stinger and J2 to stop this nearly invulnerable menace! But do these young heroes have what it takes to defeat a monster that once battled the legendary Fantastic Four to a standstill? And how does this savage confrontation result in the creation of our world's newest defender - The Earth Sentry?!