Firestorm was the third short film in the DC Cinematic Universe, and was released on the SHAZAM! Blu-ray DVD. The events of Firestorm take place in between the events of Green Lantern: The Fear Within and the seventh episode of G.C.P.D.'s third season.
- Zac Efron as Ronnie Raymond/Firestorm
- David Strathairn as Martin Stein/Firestorm
- Simon Woods as Danton Black/Multiplex
- Michael Rowe as Christopher Weiss/Slipknot
- Sienna Miller as Louise Lincoln/Killer Frost (photo only)
Set after the events of Green Lantern: The Fear Within, the minds of jock Ronnie Raymond and scientist Martin Stein come together once more to become Firestorm! Years ago, college student Ronnie Raymond and his physics professor Martin Stein were caught in a nuclear accident that allowed them to fuse together to form the superhero Firestorm, with flight and pyrokinesis as their powers, as well as nucleokinesis. In present day, Ronnie and Professor Stein fuse together to take on Multiplex, a man who can create duplicate bodies of himself, and Slipknot, who owns durable ropes that can stick to anything. With Multiplex and Slipknot teaming up, it's up to Firestorm to save the day!