Battle of the Planets

Silent City (1x57)

Air date: Oct 22, 1979

This episode takes place on planet Exor. One of their island cities is surrounded by an impenetrable wall of radiation created by a Spectra bombing attack. Chief Anderson believes the city is a Spectra base and sends G-Force to check it out. The team goes into the city, but they are only able to withstand the radiation for one hour. They are attacked by a Spectra Mecha once they are inside the city. Can G-Force escape the Mecha and solve Spectra's latest plot before their time runs out?