Jay Garrick (John Wesley Shipp) and Jesse Quick (Violett Beane) can both be found in the newly-released official photos from the March 6 episode of The Flash which is titled “Enter Flashtime!”
Here are the photos; the description can be found underneath the slide show.
JESSE QUICK AND JAY GARRICK TEAM UP WITH THE FLASH — When a nuclear bomb detonates in downtown Central City, Barry (Grant Gustin), Jesse Quick (guest star Violett Beane) and Jay Garrick (guest star John Wesley Shipp) slow down time by entering Flashtime. As everyone in the city is frozen, the three speedsters push themselves to the breaking point to save the city and everyone in it. Gregory Smith directed the episode written by Todd Helbing & Sterling Gates (#415). Original airdate 3/6/2018.