By Michaela Sinclair
Special to MSN TV

Last fall, television viewers received a double dose of fairy tales when the freshman seasons for "Grimm" and "Once Upon a Time" debuted concurrently. "Once Upon a Time"  had strong ratings on Sunday nights while "Grimm" did well despite its tricky Friday night timeslot. As there seems to be no shortage of fairy-tale fans, it looks like the two series have found their "happily ever after" as they enter their sophmore seasons. But with both showing similar content (each aired episodes on Little Red Riding Hood within days apart), we may eventually run into some trouble distinguishing which witch is which. Here's a handy guide to help us out.

Bing: 'Grimm' | 'Once Upon a Time'

(NBC/ABC)

Which fairy-tale series is best in your book? "Grimm" or "Once Upon a Time?" Sound off on MSN TV's Facebook and Twitter.

"Grimm" returns Monday, August 13, at 10 p.m. ET/PT on NBC.