2 BECOME 1

Other symbiotic relationships in sci-fi

JADZIA DAX In Star Trek: Deep Space Nine, DS9 science officer Jadzia Dax carries the memories of the seven previous hosts of the worm-like symbiont that lives inside her. When Jadzia dies, the symbiont’s passed on to new crew member Ezri.

THE JAFFA While Stargate: SG1’s Goa’uld take everything from their hosts, their larvae give human incubators the Jaffa more control. In return for providing a place to grow, the host gets extra strength and a longer life.

MELANIE AND WANDERER In one of those insidious alien invasions where the visitors possess the human race, the “Souls” in Stephenie Meyer’s The Host usually erase their host’s personality. But Melanie Stryder’s self continues to shine through after being assimilated by “Wanderer” – and the pair become unlikely BFFs.

YIVO/OUR UNIVERSE Why settle for bonding with a single creature when you can have an entire universe? In Futurama special “The Beast With A Billion Backs”, lonely Yivo, a being from a dimension where it was the only living thing, shares its tentacles with all of us – which, frankly, is just a bit icky. Richard Edwards