Amy now has a baby, but she and Melody are held captive in the season finale by panto-style villainess Madame Kovarian (Frances Barber).
Amy's baby is named "Melody" now? Melody Pond? Actually, it kind of works. But doesn't "Melody Pond" sound like an awkward inversion of "River Song"? As in, Melody and Song, and River and Pond? Or are we reading too much into this?
So the Doctor recruits a posse for a battle River Song calls his "darkest hour". There are bewildering moments, but plenty of fun, too and an arresting denouement.
Source credit goes to Doctor Who TV.