An invasion  force  of  aliens
were defeated by  the Starship
ZARK as they orbited Venus.

The labs at Earth's station on
Venus have sent down  a  self-
propelled   ball  of  uranium,
dubbed "Patchwork Heart", deep
into the crust  of the planet,
to destroy the horrid monsters
that  appeared soon after ZARK
destroyed the invading aliens. 

The creatures appear to be the
animated  organs of  the  very
same  monsters.   This  sounds
incredible  but that's the way
this author calls it!     

The uranium's radiation should
hold the monsters  at bay, yet
in case it doesn't,  a special
amplification   crystal    was
installed. 