The below description is taken from LEGO.com.
When thereís no chance of success, Iím on the job.
Codenamed ďAgent AĒ, the Spy is the ultimate secret agent. Few have ever seen him in action, and almost nothing is known about his identity or past. His first recorded mission on file was for the organization known as Alpha Team, when he triggered a mind-control orb self-destruct program that toppled the evil Ogelís latest scheme for world domination and freed his brainwashed Skeleton Drone minions.
Several years later, following the Zed Incident, the Spy was spotted infiltrating the volcano lair of Dr. Inferno shortly before its implosion. Although presumed lost in the line of duty, he resurfaced in the daring rescue of captured Galaxy Squad pilot Solomon Blaze from alien Buggoids before disappearing once again. If you need the Spy, donít try to find him Ė heíll find you!