VANCOUVER, BC. The worlds of The CW's "The Flash" and "Arrow" have been tip-toing around each other since last fall.
First Grant Gustin's Barry Allen was introduced in several Season 2 "Arrow" episodes, with Danielle Panabaker's Caitlin and Carlos Valdes' Cisco making their first appearances in the spring.
Then, the "Flash" pilot couldn't be complete without Barry zipping over to Starling City to get Arrow's blessing on his new superhero alter ego. Emily Bett Rickard's Felicity made a visit to Central City later in the fall.
Finally, though, this is the week that the words of "Arrow" and "The Flash" come crashing together with Tuesday's (December 2) "Flash vs. Arrow" and Wednesday's "The Bold and the Brave."