• Actor Patrick Dempsey presents the award for favorite pop/rock band duo or group during the 42nd American Music Awards in Los Angeles, California November 23, 2014

Actor Patrick Dempsey presents the award for favorite pop/rock band duo or group during the 42nd American Music Awards in Los Angeles, California November 23, 2014 (Photo : REUTERS/Mario Anzuoni)

When "Grey's Anatomy" Season 11 resumes with Episode 21, Patrick Dempsey's Derek Shepherd takes the center-stage. The upcoming segment is titled "How to Save a Life" and will focus on Derek and his heroic acts as he gets into action to save lives after witnessing a spine-chilling tragedy. Here are few spoilers for the next episode of "Grey's Anatomy" Season 11. Read on to find out what's next for Derek.

Like Us on Facebook

[Spoiler alert! This article contains spoilers for "Grey's Anatomy" Season 11. Please do not read further if you don't want to know more about it.]

In Episode 20, Meredith tried to contact her husband, but he remained unreachable. His absence caused immense panic. Meanwhile, the cliffhanger at the end of the segment prompted speculations suggesting Derek might already be dead.

But Derek is doing well and he is alive, assures the synopsis and latest promo videos for "Grey's Anatomy" Season 11 Episode 21. ABC has released the synopsis for "How to Save a Life" on its official website hinting where Derek has been.

According to the press release, another disaster takes place in the upcoming episode. Derek reportedly witnesses an appalling accident involving two cars. Immediately, he gets into action to save the lives of the horribly wounded victims of the accident.

A promo video (as published on YouTube.com by Television Promos) gives a glimpse of the events of the "How to Save a Life." It is the episode "America will never forget," says the voiceover in the video.

Second promo video (as published on YouTube.com by Bluesky6134) showcases how the car accident took place and where he was when it happened. Derek is driving to the airport while he is speaking to Amelia and Bailey on the phone. Derek's call gets disconnected and he sees a car at really high-speed passes him by. At some distance, the car collides with an SUV which results in an explosion. Scroll down to watch the videos.

What are your thoughts about this episode? Let us know!

"Grey's Anatomy" Season 11 Episode 21 "How to Save a Life" airs April 22, 2015 at 9:00 pm on ABC. Stay tuned for more spoilers.