Shonda Rhimes' "Grey's Anatomy" Season 10 finale is upon us and it is suggested that viewers bring tissues when watching it. ABC's long running medical drama is known for its tragic season finales and fans are eager to know what's in store this time. Fans must know Episode 24 titled "Fear (of the Unknown) is literally 'explosive.' Read on to find out the details and watch latest preview video. Also, find out Shonda Rhimes' thoughts on the upcoming episode. [Warning: Spoilers Alert!]

This article contains spoilers from "Grey's Anatomy" Season 10 Finale-Episode 24 "Fear (Of the Unknown)." Read only if you want to learn more about it.

Fans know that Episode 24 will not only feature season finale but also beloved actress Sandra Oh's and her fan-favorite character Cristina Yang's final segment. With so many spoilers swirling around, it is known that Cristina's farewell episode will see the consequences of a massive disaster. "Grey's Anatomy" Season 10 Finale-Episode 24 "Fear (Of the Unknown)" synopsis (as published by Wetpaint) hints at a "possible act of terrorism" in Seattle that will "cause chaos at the hospital."

But what actually happens? A newly released preview video tells exactly what has happened in Seattle.

The preview shows an explosion at a Seattle mall and it is still unconfirmed if the explosion is actually an "act of terrorism." As soon as Grey Sloan Memorial Hospital's chief Owen Hunt (Kevin McKidd) and April Kepner (Sarah Drew) learn about it while watching TV in the hospital lobby, a situation of emergency arouses. Two of them anticipate the incoming chaos and they try to prepare for it beforehand.

The preview begins with April Kepner approaching Owen Hunt. He urges her to speak out what she wants to. April breaks the news that she is pregnant. She tries to assure Owen that this sudden development will not hinder work at hospital and she will work until it "falls out" of her. While responding to the big news, Hunt congratulates Kepner. Later, she finds Owen distracted by the news on TV which informs that there has been an "enormous explosion that happened only minutes ago at Seattle's The Mall of the Woods." There are "massive fatalities and scores of people injured." Scroll down to watch the video as uploaded by BlueSky 6134 onYouTube.com.

Fans are anticipating a big season finale since as this episode marks Sandra Oh's last appearance on the show. As per the synopsis, this episode will also see Meredith (Ellen Pompeo) making a "life-changing decision." Furthermore, a doctor is going to receive "shocking news."

Meanwhile, show's creator Shonda Rhimes has been talking about the much awaited season finale and keeping her fans updated about it via Twitter. In her recent post on Twitter, Shonda Rhimes suggests that fans can expect an emotional and heartbreaking Season 10 finale. It also happens to be one of her favorites.

Shonda Rhimes wrote on Twitter:

Tomorrow is season finale of #GreysAnatomy and @IamSandraOh's final ep. It's also one of my fave finales ever. Bring tissues. And a friend.

— shonda rhimes (@shondarhimes) May 14, 2014

In another Tweet while addressing her fans, she informed that even the "crew cried when they saw it." The tweet reads:

So many questions about our #FarewellToCristina! Thank you all so much. Know that even 10 seasons crew cried when they saw it... — shonda rhimes (@shondarhimes) May 15, 2014

So are you ready for it? "Grey's Anatomy" Season 10 Finale-Episode 24 "Fear (Of the Unknown) airs May 15 at 9 pm ET on ABC. Watch the preview video, below:

Video: Grey's Anatomy Sneak Peek 10.24 - Fear (of the Unknown) (2)

Credit: BlueSky6134

For more spoilers on "Grey's Anatomy" Season 10 Finale (Episode 24) "Fear (of the Unknown)" and more, read below:

'Grey's Anatomy' Season 10 Finale Spoilers, First Look: When is Season Finale? Few Things to Know About Episode 24 'Fear (of the Unknown)

'Grey's Anatomy' Season 10 and Sandra Oh's (Cristina Yang) Finale Spoilers: Things to Expect; 'Heartbreaking Send-off' and Terrorist Attack

'Grey's Anatomy' Season 10 Finale- Episode 24 Spoilers: 10 Things to Know About 'Fear (of the Unknown)'; Shonda Rhimes Teases Cristina's Farewell [Videos]