The Arrow season 2 finale, "Unthinkable," is set to air Wednesday.  The CW has released a preview for the episode that begins with a great enticer: "The man murdered my mother.  I have to kill him."  What happens at the end of the clip may be of more interest to some.  The voiceover teases a first look at The Flash as The CW's next superhero whizzes by the screen.  We also get to see the new Flash logo.

Click here for our overview of The Flash's comic history and check back Wednesday night for Dave's recap of the Arrow season finale.  The CW will announce its new fall schedule at the Upfront event on Thursday.  Watch the "Unthinkable" preview with after the break.

Here's the logline for The Flash:

Through a freak accident, scientist Barry Allen is given the power of super speed that transforms him into the Fastest Man Alive, in THE FLASH.