<s>
is	O
an	O
action-adventure	O
video	O
game	O
developed	O
by	O
Team	O
Tachyon	O
and	O
Now	O
Production	O
and	O
published	O
by	O
Tecmo	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
.	O
</s>
<s>
Undead	B-Application
Knights	I-Application
is	O
an	O
action-adventure	O
game	O
in	O
the	O
style	O
of	O
God	O
of	O
War	O
.	O
</s>
<s>
Captain	O
Gerrard	O
,	O
a	O
leader	O
of	O
a	O
trio	O
of	O
knights	O
who	O
praise	O
Fatima	O
as	O
a	O
saint	O
,	O
uses	O
the	O
Fruit	O
of	O
the	O
Holy	O
Tree	O
after	O
finding	O
out	O
his	O
daughter	O
was	O
killed	O
in	O
a	O
battle	O
with	O
the	O
Undead	B-Application
Knights	I-Application
and	O
becomes	O
a	O
giant	O
demon	O
known	O
as	O
the	O
Nephilim	O
.	O
</s>
<s>
Later	O
,	O
the	O
undead	B-Application
knights	I-Application
encounter	O
various	O
genetically	O
engineered	O
soldiers	O
called	O
Ouroboros	O
created	O
by	O
the	O
mad	O
,	O
egocentric	O
wizard	O
Lord	O
Follis	O
(	O
Liam	O
O'Brien	O
)	O
,	O
who	O
attempted	O
to	O
convince	O
the	O
knights	O
to	O
join	O
them	O
,	O
only	O
to	O
be	O
told	O
off	O
.	O
</s>
<s>
In	O
the	O
game	O
's	O
epilogue	O
,	O
the	O
trio	O
admits	O
that	O
they	O
will	O
serve	O
the	O
punishment	O
for	O
their	O
sins	O
in	O
vengeance	O
as	O
"	O
undead	B-Application
knights	I-Application
"	O
.	O
</s>
<s>
On	O
October	O
1	O
,	O
2009	O
,	O
the	O
Undead	B-Application
Knights	I-Application
demo	O
was	O
mistakenly	O
replaced	O
with	O
the	O
full	O
game	O
on	O
the	O
PlayStation	O
Store	O
,	O
giving	O
consumers	O
an	O
opportunity	O
to	O
download	O
the	O
full	O
game	O
for	O
free	O
.	O
</s>
