From the Back of the Book:
Cobra is attempting to infiltrate and destroy the GI Joe Team. Only YOU can stop them in OPERATION: MINDBENDER.
Army spy planes have picked up evidence of covert military operations on a small island in the South Pacific. Your team - Leatherneck, Airtight, Beach Head, and you, Commando - have been sent to investigate.
But suddenly Beach Head and Airtight attack you and Leatherneck! It's unbelievable, but you find yourself in a vicious fight with your own team members!
When it's over, you notice that Beach Head and Airtight are disoriented and confused. They see you as the enemy. They have been brainwashed!
You have to save your friends from Cobra's clutches - and make sure this brainwashing doesn't happen again. Vital decisions are up to you as you FIND YOUR FATE.