David Ramsey, who plays John Diggle on "Arrow," posted a photo of his recent trip to "The Flash" writers' room, which he said "can only mean one thing."

While his comment seems to suggest another "Arrow"/"Flash" crossover, it isn't clear what the scale of this second event would be; the last crossover involved every member of both teams, plus a few characters from "Legends of Tomorrow." What Ramsey may be suggesting is simply a few characters appearing on "The Flash" or vice versa. However, a trip to Central City looks like it will be in Digg's future.

Starring Grant Gustin, Jesse L. Martin and Carlos Valdes, "The Flash" returns to The CW at 8 pm EST on January 19. Starring Stephen Amell, Neal McDonough, David Ramsey and Emily Bett Rickards, "Arrow" returns to The CW on Wednesday, January 20 at 8/7C.