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Greys Anatomys polarizing Alex-Izzie reunion episode changed dramatically from script to screen and the shows top EP is divulging details about the 11th hour tweak.

As showrunner Krista Vernoff reveals to TVLine, Elizabeth Finchs original and beautifully written script for the pivotal Season 16 episode that served as Justin Chambers swan song referenced Alex and Izzies twins Eli and Alexis, but viewers were not supposed to actually meet the children. Greys co-star and EP Debbie Allen, who directed the March 5 hour, fought really hard to cast and shoot the kids, says Vernoff. None of that was in the original script. And that was my favorite material in the episode the visuals of those two kids. (Watch video of Eli and Alexis frolicking in the flesh on Izzies farm in the video below.)

Vernoff adds that Leave a Light On was a labor of love for the entire cast and crew, particularly longtime editor Vanessa Delgado, who was tasked with putting together 16 seasons worth of clips for the flashback-heavy episode, which gave closure to not only Alexs storyline but Izzies as well.

The Izzie story and those eggs was just hanging out there since Katherine Heigls abrupt 2010 exit, Vernoff notes. I thought it was amazing that we could finally let people know that Izzie was alive and well and raising [Alexs] kids.

Launch Gallery: Grey's Anatomy: Best of Season 16

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Grey's Anatomy Star and EP 'Fought Really Hard' to Cast [Spoiler] in Alex's Nostalgia-Heavy Farewell Episode - Yahoo Entertainment