Titanians
Titanian #1 - the leader of the invasion of Earth (episodes 18-26)
(does not appear in monster forme)
19: 02-18-1973 Titanian #2: Kabutoron: sprays Balloon Bombs out of its mouth, red balloons that explode releasing a toxic gas, can also release the gas directly and on top of its head is giant drill - when it first giant sizes only Kirishima, Goro can see it for what it really is, a space bug, all Shizuka, Gentaro sees is a giant man in a mask and cape and he's not impressed
23: 03-18-1973 Titanian #5 :Kangarole: sprays acid and breathes fire, flans the flames with its wings - takes possesion of Fujimoni, Noriko in order to kidnap a rocket scientist's secretarym then tells Gentaro and Goro it is the secretary who has been possessed
25: 04-01-1973 Titanian #7: Cricketton & Possessed Iron King: Cricketton fires off explosive charges and shoots off its wrench shapped limbs as missiles - Titanian #7 kidnapped "Tenko" while Gentaro and Goro were destracted by burning dumies of Gentaro & Iron King, her broach has a homing beacon which #7 turns on after tiring her up so she can't turn it off in order to lure them into a trap , Gentaro, Goro and Iron King rescue her but the next morning Goro is possessed and attacks Gentaro, while those two are fighting, #7 attacks Tokyo, at this point the Titanians don't seem to realize they have Iron King under their control but Gentaro doesnt know Goro is Iron King ether after knocking Goro out he planned to take Goro back to headquarters which would have been the smart thing but when the monster attacks Tokyo he stops and ties Goro to a tree instead which was a very foolish thing to do as once Goro awakens he becomes Iron King and joins Cricketton in attacking Tokyo
With the invasion of the Titanians stopped Japan is finally at peace (as far as Iron King is concerned)