Tue, 29 March 2016 at 4:00 pm

Rick Cosnett is Back on Tonight's 'The Flash'!

Eddie (Rick Cosnett) makes a guest appearance in this still from tonight’s all-new episode of The Flash.

In “Flash Back,” after the shocking revelation that Zoom is Jay Garrick (Teddy Sears), Barry (Grant Gustin) is more determined than ever to get back to Earth-2 to stop Zoom forever.

Desperate to find a way to increase his speed, Barry decides to travel back in time and masquerade as his earlier self in order to get his arch-nemesis, Dr. Harrison Wells/Eobard Thawne (Tom Cavanagh), to teach him how to run faster.

However, things don’t go as planned and Barry is stunned to face familiar foe Hartley Rathaway (Andy Mientus), as well as old friend Eddie Thawne.

Iris (Candice Patton) makes peace with her past in order to embrace her future.

The Flash airs TONIGHT, March 29 @ 8PM on The CW.