A treat indeed, combining superhero goodness with classic alien antics! What if that Roswell 'incident' back in 1947 had deposited four 'Greys'... and they'd decided, for reasons unfathomable to puny mortal minds, decided to become agents of some alphabet soup US government agency?
Complete with a supporting cast of human beings, here's the 'Grey Ops' Unit, operating out of Area 51 (naturally!), spending their down time absorbing Earth pop culture whilst their day jobs sends them out to combat threats to Truth, Justice and the American Way wherever they dare to raise their ugly four-coloured heads. Or at least, paranormal and alien incidents, that being their specialty. For the sake of mankind's sanity - or at least, so as not to scare the horses - they have the ability to shapechange into reasonably human form when out and about.
A wealth of detail is packed into a few pages, bringing each character to life - whether you fancy playing them yourself, or want to use them as NPCs - complete with paper standees you can cut out and use for those action scenes when you want to get the battlemaps out.
It's all rather fun and a good way to bring in a classic 'alien' theme with a neat twist into your M&M game.