A week after Bones aired its 100th episode, Supernatural follows suit on April 15.

The episode, titled "Point of No Return," focuses on Dean, Sam and Castiel trying to stop Zachariah and prevent an all-out war on the planet. Also, a familiar face returns. 

For a larger look at what's ahead, visit our Supernatural spoilers section. Below, meanwhile, we've posted the official CW preview for the episode, followed by a clip from it.

[video url="http://www.tvfanatic.com/videos/100th-episode-preview/" title="100th Episode Preview"] [/video]

[video url="http://www.tvfanatic.com/videos/point-of-no-return-clip/" title="Point of No Return Clip"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.