  The role of Sinister Heavy Fermions in recent Glashow's
SU(3)*SU(2)*SU(2)'*U(1) model is to offer in a unique frame relic Helium-like
products (an ingenious candidate to the dark matter puzzle), a solution to the
See-Saw mechanism for light neutrino masses as well as to strong CP violation
problem in QCD. The Sinister model requires a three additional families of
leptons and quarks, but only the lightest of them Heavy U-quark and
E-"electron" are stable. Final neutral Helium-like UUUEE state is an ideal
evanescent dark-matter candidate. However it is reached by multi-body
interactions along a tail of more manifest secondary frozen blocks. They should
be now here polluting the surrounding matter. Moreover, in opposition to
effective pair quark annihilations, there is no such an early or late
tera-lepton pairs suppressions, because:a) electromagnetic interactions are
"weaker" than nuclear ones and b) helium ion 4He++ is able to attract and
capture, E-, fixing it into a hybrid tera helium "ion" trap. This leads to a
pile up of relic (4HeE)+ traces, a lethal compound for any Sinister Universe.
This capture leaves no Tera-Lepton frozen in Ep relic (otherwise an ideal
catalyzer to achieve effective late E+E- annihilations possibly saving the
model). The (4HeE)+ Coulomb screening is also avoiding the synthesis of the
desired UUUEE hidden dark matter gas. The e(4HeE)+ behave chemically like an
anomalous hydrogen isotope.Also tera-positronium (eE+) relics are over-abundant
and they behave like an anomalous hydrogen atom: these gases do not fit by many
orders of magnitude known severe bounds on hydrogen anomalous isotope, making
grave shadows over a Sinister Universe. However a surprising and resolver role
for Tera-Pions in UHECR astrophysics has been revealed.
