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Alien parasites that attaches itself to humans and then controls them - has been brought onboard Babylon 5. Marcus has a wide array of contacts down below, and one of his most trusted ones doesn't show up. When going to look for him, it turns out that the contact has changed. When looking for another dear friend, that has gone missing, Marcus gets worried. Ivanova needs to find out if the newly appointed lieutenant David is to be trusted to be invited to partake in the secret alliance. David mistakes her interest as a romantic interlude.