There have been several references of the superhero Flash on The Big Bang Theory, with Sheldon and Leonard donning the Speedster's outfit, reading Flash comic books and the genius often wearing a t-shirt the Flash's logo. And now, actor Mayim Bialik has posted a cryptic message on Twitter and teased a "flash" guest appearance in season 10 on the CBS sitcom.

Bialik posted an image alongside actor Brandon W. Jones and wrote: "Thanks for your "flash"y guest spot @brandonwjones !!!"

Jones replied to Bialik's post and said, "You're so sweet! You guys rock :) #BigBangTheory"

Although the Pretty Little Liars actor is not affiliated to The Flash, it seems like the Speedster could possibly appear in Sheldon's dream.

Bialik went on to add a bit more about the actor and again teased the Flash theory on Instagram. She posted the same image and wrote, "He's sweet, he's southern and he feels comfortable in latex. Brandon Jones, we had fun having you guest star this week!"

The Flash suit is made of latex and her cryptic tease about the actor being comfortable in them suggests that the Flash could appear in season 10 of The Big Bang Theory.

The upcoming season will pick up from the cliffhanger ending involving Sheldon's mother Mary Cooper and Leonard's father Alfred Hofstadter in season 9. The premiere episode will feature everyone dealing with an awkward morning following Sheldon's mother and Leonard's father spending an evening together. Also, Penny's family – anxiety-ridden mother Susan and drug-dealer brother Randall – will arrive for Leonard and Penny's wedding ceremony.

Season 10 of the CBS show is currently filming and will premiere on 19 September at 8pm EST.