An extraterrestrial infectious particle found in a
lunar rock sample and within a fantastically
well-preserved tyrannosaur fossil in the New Mexico desert.
It is later revealed that the organism came to Earth
via the Chicxulub asteroid which wiped out the dinosaurs.
The particle, which was named for its resemblance to the
symbol of Venus and femininity, causes rapid mitosis and
apparent cellular differentiation in its host.