If you like this, you're going to love Polydnaviriformidae, the family of host-behavior and -immune-system manipulating viruses that's mutualistic with a couple of families of wasps - who vertically inherit the entire viral genome mother to daughter, along with that of a unique glandular bioreplicator - and, unless there's a somewhat new result in viral phylogenetics, not very closely related to anything else known in nature.