Adam Horowitz and Edward Kitsis are the creators of OUAT and also wrote episodes of the TV show "Lost"
Other people who had connection with OUAT and Lost are-
Emilie De Ravin (Belle) who played Claire Littleton in 72 episodes of Lost.
Jorge Garcia (Anton the giant) who played Hugo "Hurley" Reyes in 114 episodes of Lost. (He also guest starred on two episodes of HIMYM with Jennifer Morrison (Emma) who also guest starred on HIMYM for 13 episodes.)
Alan Dale (King Dirtbag, oops autocorrect. King George) who played Charles Widmore in 17 episodes of Lost.
Naveen Andrews (Jafar in "Once Upon a Time in Wonderland" a spinoff series of OUAT and created by Adam and Edward too) who played Sayid Jarrah in 91 episodes of Lost.
Rebecca Mader (Zelena) who played Charlotte Lewis in 17 episodes of Lost.
Lana Parrilla (Regina) who played Greta in 2 episodes of Lost.
Eric Lange (King Leopold) who played Stuart Radzinsky in Lost. (I couldn't find out how many episodes he was in of Lost and I haven't gotten to the episode he's in yet, all I found out was he was in season five. So if you know how many episodes he was in of Lost please let me know)
Zuleikha Robinson (Amara OUATIW) who played Ilana Verdansky in 24 episodes of Lost.
Elizabeth Mitchell (Ingrid) who played Juliet Burke in 55 episodes of Lost.
Thank you Buzzfeed.com for their article: A Comprehensive List Of All The Actors From "Lost" Who Have Now Appeared On "Once Upon A Time"
Which helped me a lot with this post.
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OUAT: Did you know?
RandomThings you may not have known about the TV show Once Upon A Time and their actors. If you know that any of these DYK's are false or not entirely true please let me know.