‘The Americans,’ Season Finales (‘Modern Family’ and More)

Jane Krakowski and Sofia Vergara on 'Modern Family'

A selective critical checklist of notable Wednesday TV:

Modern Family (9/8c, ABC): The centerpiece of an all-finale sitcom lineup, Modern sends Mitchell (Jesse Tyler Ferguson) and Phil (Ty Burrell) in costume to a “Hero-Con” fanboy convention, dressed as their favorite “Clash of Swords” characters. What could go wrong? Back home, Gloria (Sofia Vergara) throws a dinosaur party for little Joe (Jeremy Maguire), but is upstaged by the festivities hosted next door by her arch-rival, Dr. Donna Duncan (Jane Krakowski).

Inside Wednesday TV: As FX’s gripping The Americans (10/9c) races to its finale, the arms control summit gets underway — the perfect opportunity for Philip (Matthew Rhys) to deliver another bombshell to Elizabeth (Keri Russell). … The Big Bang Theory’s Johnny Galecki moonlights as host of Science Channel’s Scijinks (10/9c), a prank show with a scientific bent. … NBC News hitches a ride on the royal bandwagon with the special Inside the Royal Wedding: Harry and Meghan (10/9c), hosted by the Today team of Savannah Guthrie and Hoda Kotb and filmed in Europe, Africa and the U.S.