Silver Heat Mask is a Black Cross Army Masked Monster. His head resembles that of a common house fly. While he carries a gun, he also has a powerful "Silver Heat Power", which can burn through anything.
Silver Heat Mask's scheme involved using his Silver Heat Power combined with a device to burn Tokyo in example of an ultimate scheme of the Black Cross Army to destroy the world. While the Gorenger pursue him due to his danger, he ends up capturing Yoko Kato, unknowing initially that she is EAGLE Agent 007 (who assists the Gorenger) as well as her little brother Taro. Upon his instructions, Yoko draws out the Gorenger where the Black Cross attack the team, hurting Akira in the process but allowing for her freedom while her brother remains a hostage and he continues to use the device to burn up Tokyo.
Yoko returns with a bomb in hopes of sacrificing herself to eliminate Silver Heat Mask and save her brother, but Kaijo prevents her from using it on him. The duo infiltrate and draw out Silver Heat Mask, save Taro and ultimately the Gorenger take him out with the Gorenger Storm.
Notes
- Silver Heat Mask somewhat resembles Kamen Rider X; given Shotaro Ishinomori created both Kamen Rider and Gorenger, this may not be a coincidence.