According to the introduction to "Critical Mass," the product's goal is to "give a busy GM a quick scenario with everything he needs." The product meets this goal, though an uncomfortably high number of grammatical and/or editing errors—at least one of which is very significant—mar the presentation. The storyline is entertaining enough, and feels very much like a one-shot comic book. The scenario provides opportunities for both combat and non-combat resolution to the challenges presented. As a Superlink product, the adventure is fully statted out for Mutants & Masterminds, but a GM can easily adapt the scenario to any system. I mentioned that one of the writing errors is very significant; the word "killed" appears to have been left out of the critical sentence "the mercenaries have [killed] one of the scientists" when describing a key plot point! However, a good GM will undoubtedly be able to fill in any blanks. You should be able to get a good session of fun out of this scenario, and at just $2.00, it's a good value.