Below is the concluding part of the last ( and unpublished) Jeff Hawke story, written by science writer Duncan Lunan. We heard in the last part how Fortuna learned the history of the aliens’ presence around Uranus and how the renegade alien leader , in suspension for aeons has now grown to fill much of the hub.  Duncan takes up the final part of the story:

“To keep him alive for so long and supply his growth, the robot processing units have extensively mined out the ground below the hub. Unwanted ice has been processed to fill up the lower part of the hub: with the energies of the electrostatic weapon directed inwards on to the base of this ice core, a propulsion system analagous to the Ice-Needle will be operational. This was all planned by the followers before the end.

So our alien villain now has the means to blast off from Umbriel and go sunwards, and a very powerful weapon to use when he gets to Earth, ‘to put its eye out’ as Mclane has partly done to his.   Afterwards, no doubt he has the means – cloning or whatever – to propagate his species when he gets there.   The only thing holding him back hitherto has been that the Japanese captives, who didn’t know about C-Day, told him before they died that there’s a very powerflul high-technology civilization to resist him. But in the process of the mental battle to let the Task Force get away, Fortuna and Lance have given away the fact that this is no longer the case: Earth is vulnerable.
So he reconfigures the electrostatic system for propulsion, and takes off.   However, he still has his mental link to the old scientist on the Ice-Needle, and as the latter comes around in orbit, he fires the rocket motors and rams the habitat hub amidships, piercing the giant alien with the remaining spike of the ice. The whole thing cartwheels and crashes back on to Umbriel. I leave it to you
whether the scientist dies a glorious Kamikaze death, to assuage the shame of having brought this threat upon mankind (and death to his colleagues), or whether Fortuna persuades him to bail out and be rescued.   As orbital velocity around Umbriel will be low, that could happen after the ramming.

(NB) The alien can’t use the electrostatic weapon to stop the Ice-Needle from ramming him because he’s reconfigfired the system for propulsion.)”

My thanks to Duncan for  generously providing the above story , which otherwise would probably never have seen the light of day. Skipper Prossitt