ShadowDragon8685
Mongoose
Depending on just how hopeless you want things to be, you could co-opt the Beast organism from Homeworld: Cataclysm.
Essentially a growing, learning, intelligent parasite, it 'infects' whole starships, co-opting them - biomechanical in nature if interfaces just as readily with machines as people, capable of breaking down organic matter and using it to grow - turning the poor folks who were aboard whatever vessel it conquered into the control systems.
Nasty stuff. And worse, if it captures a large enough vessel, that vessel can project more of the stuff out as an infecting weapon attack that can convert other vessels in a hurry.
Making it chain-lightning through multiple craft is probably overkill, though.
Essentially a growing, learning, intelligent parasite, it 'infects' whole starships, co-opting them - biomechanical in nature if interfaces just as readily with machines as people, capable of breaking down organic matter and using it to grow - turning the poor folks who were aboard whatever vessel it conquered into the control systems.
Nasty stuff. And worse, if it captures a large enough vessel, that vessel can project more of the stuff out as an infecting weapon attack that can convert other vessels in a hurry.
Making it chain-lightning through multiple craft is probably overkill, though.