If Star Trek: Picard’s third season really is the last hurrah for The Next Generation crew – that remains unconfirmed – it’ll be the latest instalment in sci-fi’s longest goodbye. It feels like we’ve been waving farewell to Jean-Luc, Riker, and co for nearly 30 years, from the sublime send-off of ‘All Good Things’ (one of the greatest series finales of all time) to the infamously disappointing Star Trek: Nemesis – though the latter’s “a generation’s final journey begins” tagline was rendered spectacularly obsolete when Jean-Luc rematerialised in his own show nearly 18 years later.