
Doorways into Darkness
Deep in Africa Ming locates an anti-energy source enabling him to open the Nightgiant Doorway and unleash 7-story tall nightgiants to destroy the earth. Flash flies out to space to destroy a Ming satellite, but his ship is immoblized by the Merciless One's roboships, while the Phantom goes to Africa to terminate Ming's activities in the Forgotten City. As the nightgiants terrorize various parts of the globe Rick intercepts a transmission from Ming to Garax and discovers that a transport invertor will eliminate the monsters. Mandrake, Lothar, Rick, L.J., Jedda, Kshin and Zuffy take on two nightgiants outside of Central City while racing to the stadium to retrieve the saving invertordevice. As they recover the device, Rick is captured by one of the creatures. Jedda departs for Africa, where her father will use the transport invertor to close the nightgiant doorway, while the other Defenders save Rick. Out in space Flash finally fights off all of Ming's minions and blows the satellite. Jedda delivers the transport invertor to the Phantom and they battle Ming's troops before employing the device and sending the nightgiants back to their own world.
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More from this season

S1 E1
Escape from Mongo
When Ming the Merciless leaves Mongo to invade Earth, his old enemy Flash Gordon and the latter's son, Rick, join forces with six others - the youngest a pre-teenaged boy named Kshin - to form the Defenders of the Earth.

S1 E2
The Creation of Monitor
Aided by Flash's Krell allies, the Defenders begin building their base. But Ming has learned of their existence and resolved to put an end to them.

S1 E3
A Demon In His Pocket
Some boys try to pick a fight with Kshin so, rather than break the Defenders' Code of Honour, he reads up on summoning spells - against Mandrake's orders - and calls forth a demon named Shogoff (sp?). But Shogoff isn't content with just beating up a few pre-teenaged bullies and starts causing havoc in Central City; at one point, Mandrake collapses on stage when he senses the demon's presence. Kshin, meanwhile, is faced with a dilemma - should he let Shogoff continue his rampage or confess to his part in the trouble and risk expulsion from the Defenders?

S1 E4
A House Divided
When Africa suffers a sudden and unexplained climate change, the Phantom and Jedda head there to investigate. In the process, the Phantom learns that his estranged brother, Kurt - whom he has never mentioned to Jedda - has (courtesy of Ming) acquired the power to control the weather.