'Once Upon a Time' Preview: Mother (VIDEO)

Here's the video preview and synopsis of Once Upon a Time Season 4 Episode 20: "Mother" on ABC.

Only one episode left until the series changing two hour finale!

Once Upon a Time 4x20 Promo "Mother"

Air Date: May 3, 2015

Official Synopsis: A homecoming ignites a war. A victory for all that's evil grows closer. Air Date: Sunday, May 3, 2015

For more previews and recaps, check out Once Upon a Time