Personally the 'science-gone wrong' angle is good.
Now the plot turns to how "not to be totally derivative.."
Perhaps, we should explore the 'possibility' of a bad batch of nanite injected serum--like RNA memories, or skills..obtained illegally through a planet's blackmarket of course..The serum starts a reversion to extreme cannibalism, a sort of reverse evolutionary process..[Dr Jekyll/ Mr Hyde ring a bell?]..
A.the Scientists who brewed this batch up elect to use a low pop world [y]our heroes land on as their testbed.
B. As above, but they "get rid of the batch" to the local underworld, who sells it off for folks trying to make the grade to get off that dirtball to a better world and tech.
C. Players have some of these folk on their ship as passengers when they "change" and have to be dealt with..like while trapped in jump space with them!
D. As in C, but its one of the favorite NPC crewmen who gets it. Players then track it back to situation A or B...
E. Scientist X defects from the pharmaceutical company and runs for is life to players ship. antsy about getting off world as soon as possible...[see A or B as to why], and eventually tells about the deliberate/ accidental release of some of the batch into the water supply on this world..29 days ago. Day 30 the change takes affect.
F. As in E, but he/ she has the knowledge of the cure and players have to be comnvinced to jump to his lab, get the cure, and get back in time or bad things happen...very bad things..
:devil: :toast: :nonono:
