transport.
It was only when
I couldn't tell them
what I wanted
to transport
that I realized my mind
was being directed.
I decided to send
a dispatch to Starfleet
warning them.
Oh, God forgive us.
Must destroy ourselves!
Alien upon us,
the enemy
from within.
The enemy!
He never completed
the entry.
The dispatch
was never sent.
Except for scenes
of family life,
games and picnics
with the children,
that is
the complete record.
Whatever
overwhelmed them
must've done so
with incredible speed.
Otherwise, the professor
would've provided details
of the experience.
He was
an excellent scientist
and tireless
in his pursuit of the truth.
That could be
what destroyed him.
Possible, Captain.
Evil does seek
to maintain power
by suppressing
the truth.
Or by misleading
the innocent.
Misleading the innocent?
I wonder.
Do you mean
the children may be involved?
Yes, Doctor.
Spock ...
what do we know about
the race that lived here?
According to the legend,
Triacus was the seat
of a band of marauders
who made constant war throughout
the Epsilon Indy System.
After many centuries,
the destroyers
were themselves destroyed
by those
they had preyed upon.
- Is that the end of it?
- No.
Like so many legends,
this one, too,
has a frightening ending.
It warns that the evil
is awaiting a catalyst
to set it again
into motion
and send it marauding
across the galaxy.
Is it possible ...
that the evil
found the catalyst?
I was speaking
of a legend, Captain.
But most legends have
their basis in fact.
I think
I read you, Jim,
but as medical officer
I must warn you
that unless
the normal grief
is tapped and released
from these children,
you are treading
dangerously.
I understand your diagnosis,
Doctor, and I'll respect it.
But not to the exclusion
and safety of the Enterprise.
Spock,
what other expeditions
have visited Triacus?
According to
Federation records,
this is the first.
What was it
Professor Starnes said
about the unseen force?
He said an unseen force
was influencing him,
that he recognized it,
was beginning
to fight it ...
and cancelled his request
for a ship.
A ship.
Yes, a ship
for Triacus.
But why?
By whom?
Security detachment.
Ready for relief duty
on Triacus.
Assemble in
the transporter room immediately.
I'll have some questions
for that detachment
as soon as
they're beamed up.
I think it's
about time we found out
whether Professor Starnes'
enemy within
is on
the planet below
or here on board ship
with us.
Come on.
Your tour of duty
will last one hour.
Be prepared
with your communicators
to report
any alien beings.
Don't wait to investigate.
Beam down the guards.
Beam up the security detachment
from Triacus.
Spock.
What's wrong?
I am unable to lock on
to the proper coordinates.
Why not?
It appears we are
no longer orbiting Triacus.
That's impossible.
If we're not orbiting Triacus,
then the men
I beamed down ...
are dead.
Captain, we are
no longer orbiting Triacus.
Activate the bridge
monitor screen.
Captain to Bridge.
[Kirk] Mr. Sulu,
we're not orbiting Triacus.
With all respects,
Captain, you're wrong.
I have Triacus
on my screen now.
You're off course.
I'm coming right up.
Hail, hail,
fire and snow.
Call the angel,
we will go.
Far away,
for to see,
Friendly Angel
come to me.
Sulu!
Fire and snow.
Call the angel,
we will go.
Far away,
for to see,
Friendly Angel
come to me.
Friends ... we have
reached a moment of crisis.
The enemy have discovered
our operation ...
but they are too late.
They no longer
control the ship.
We do.
We shall prevail.
They will take us
any place we desire.
So back to your stations.
Maintain your controls.
If resistance mounts,
call upon their beasts.
Their beasts
will serve us well.
The fear
in each one of them
is the beast
which will consume him.
Remember how it was
on Triacus.
If they resist,
so shall it be
on the