Turns out Claire is pregnant with Alex's baby. Chosen One's baby - important development alert! Uriel figures this out, as does Arika (who we learn is her lover, making them the first human/angel lesbian couple in TV history). They get all schemey.
When Michael learns Becca, his human scientist lover, has been experimenting on angels, he FLIPS OUT and kills her in a moment of rage. Alex, already distrustful of Michael, washes his hands of the angel, who flies away.