Star Trek: The Next Generation - Season 5 Episode 20 -

Shortly after the Enterprise saves a planet from an asteroid impact by exploding it, the ship experiences strange break-downs which are ultimately attributed to an impossible to detect timely metal parasite, which will destroy it unless eliminated, so Data suggests luring it to an asteroid. Deanna Troi counsels Worf to deal with his son Alexander's authority problems by drawing up a two-ways contract on paternal and filial rights and obligations, but is still practically terrified to hear her overbearing and impulsive mother, ambassador Lwaxana, announces her own ...