Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
A 1938 15-chapter serial in which Flash and his companions search for the culprit depleting Earth's nitrogen supply.
Loading. Please wait...
There are no TV airings over the next 14 days. Add it to your Watchlist to receive updates and availability notifications.