Based on more than 9 million viewers , the season finale of Once Upon a Time was rated less than 4 out 10 .
Those numbers dipped late in the season to a series low of 8.36 million viewers and a 2.8/8 adult 18-49 rating/share in April 2012 , but rebounded slightly for the season finale with 9.66 million viewers and a 3.3/10 adult 18-49 rating/share .
Once Upon a Time -LRB-season 1-RRB-