Joss Whedon, director of the hit film The Avengers, is reportedly planning to helm a musical crossover between The Flash and Supergirl.

Whedon might sit behind the lens for the upcoming two-part episode due next year, reports

He is credited with directing two Marvel movies, The Avengers and Avengers: Age of Ultron.

He also has a history with musicals, having helmed the Buffy the Vampire Slayer musical episode Once More, With Feeling, a Glee episode Dream On and Dr Horrible’s Sing-Along Blog. The latter two feature Neil Patrick Harris.

The songs are still kept secret, but executive producer Greg Berlanti has said they "have been talking about trying to write at least one original song per episode."

While details of the crossover are still scarce, Music Meister (Batman character) is rumoured to be the villain and Harris who voiced the character in Batman: The Brave and the Bold animated series might reprise his role.