The Flash is getting a musical episode with extra Supergirl!

Those big screen DC comics book movies are a pretty dark and dour lot, but on TV things are bright and bubbly and cheerful for the most part in the worlds of The Flash and Supergirl as well as Arrow and Legends of Tomorrow.

They're a very fun antidote to the darkness which seeps into the blockbuster event movies, and they're about to get that bit sillier with the confirmation of a musical episode on the way.

Greg Berlanti is in charge of the 'Arrowverse' on the CW and he's been talking about the musical ep: