After tonight's agonizing new episode of "Grey's Anatomy," fans will be desperately wondering if and when Derek Shepherd will be found. Spoiler alert! When the show returns to ABC next week with an all-new Episode 21, "Derek's whereabouts are finally discovered," according to a press release from ABC. The upcoming episode, called "How To Save A Life" (S11E21), will finally explain Derek's shocking disappearance in Episode 20. For more exciting "Grey's Anatomy" Season 11 spoilers, including a full Episode 21 synopsis!

On tonight's episode of "Grey's Anatomy," we will witness Meredith desperately trying to get into contact with Derek throughout her tumultuous day.

The situation leads everyone to ask: Where is Derek? The Episode 20 preview video below echoes these sentiments:

Although the question may not be answered tonight, we have good news for Derek Shepherd fans.

Derek is found! Yes, that's right - McDreamy is very much alive.

But why was he completely unreachable? Simply because he was too busy being a hero...typical Dr. Shepherd.

According to a new ABC press release, in "How To Save A Life" (S11E21) we learn that "Derek witnesses a horrible car accident and springs into action to save lives, on "Grey's Anatomy," THURSDAY, APRIL 23 (8:00-9:00 p.m., ET) on the ABC Television Network."

The news will surely be a relief to Meredith and the team at Grey Sloan Memorial Hospital after their horrific day.

"How To Save A Life" (S11E21) will likely be an emotional and heart-wrenching episode for viewers, as we witness Derek step in to assist in a time of tragedy.

"Grey's Anatomy" Season 11 is nearing its end, with the finally quickly approaching on Thursday, May 14.

Have you been pleased with the way Season 11 has panned out so far? What do you think of the latest "Grey's Anatomy" synopsis and spoilers? Are you relieved that Derek is found? Voice your thoughts in the comments section below.

Episode 21 of "Grey's Anatomy" Season 11, called "How To Save A Life," will air Thursday, April 23 at 8:00 p.m. EST on ABC.