From the Back of the Book:
It's the G.I. Joe Team versus a genetically perfect warrior in SERPENTOR AND THE MUMMY WARRIOR.
How did you, Bombshell, the meanest, nastiest, most fearless G.I. Joe ever, end up in Egypt fighting a mummy? Why complain? At least it's combat!
Your enemies are formidable: COBRA scientist Dr. Mindbender. Hordes of Hun warriors. And Serpentor, Mindbender's finest creation - a genetic mix of the ten best warriors of all time. But don't forget that you came to rescue the kidnapped Dr. Wilmott and the mummy he was carbon-dating. If you don't bring them back, Mindbender and Serpentor will reanimate the mummy, unleashing its ancient powers, and civilization will face endless war.
When you explode into action, Bombshell, make sure you pick the right time and place as you FIND YOUR FATE.