5 Questions About the Frozen Storyline on Once Upon a Time

I figured Olaf would be tough to translate to live action, and show creators Adam Horowitz and Edward Kitsis killed any hope we might have about him appearing when they told Entertainment Weekly we wouldn't be seeing him. But considering that Once went for it with Elsa's ridiculous giant snow monster and the CGI troll Pabbie, why not introduce Olaf? He's Frozen's most delightful character and would bring some much-needed lightness to this storyline, which is taking itself awfully seriously so far.