This is a classic episode that gets 4 1/2 stars just because it is not quite as funny as The Tick vs. The Tick (mainly because there's no Evil Midnight Bomber here). This story starts out with Arthur nursing The Tick who is sick. Of course, it is no ordinary virus that has infected our hero, it is a most uncommon cold! Tick gets very melodramatic, saying things like "Empires have fallen at the foot of this pox!" while Arthur just rolls his eyes. I found this funny because I get the same way when I'm sick...

Arthur goes to visit apartment 14B to return some mail where he is captured by Thrakkorzog (the evil ruler of dimension 14B). Thrakkorzog wants to use an army or Tick clones to conquer the Earth and he clones Arthur and sends The Evil Arthur Clone to get a tissue sample of The Tick. Of course, because of the nigh-invulnerability, the only tissue sample he can get is from a used kleenex.

Arthur meets Thrakkorzog

The Tick faces off against a worthy adversary; the Mucus Tick!

From there, things proceed in an inevitable course, and eventually the Tick and Mucus Tick battle each other on the roof. This is a great battle and it's just too bad the Tick can't fight worthy adversaries more often...

The only other character in this episode is Thrakkorzog's roommate (a normal human) I get a kick out of this guy; he lives with a slime-based life form and he still drinks right out of the milk carton...that's guts.

This episode features these Superheroes:
The Tick and Arthur

This episode features these Supervillains:
Thrakkorzog, The Evil Arthur Clone, Mucus Tick

Tickisms

The Tick:
Ewww…mucus…the scourge of mankind!
Empires have fallen at the foot of this pox!
So, foul gelatin, you would do battle with the nose of your birth?!
I don't know the meaning of the word surrender! I mean, I know it, I'm not dumb…just not in this context...
Mucal invader! Is there no end to your oozing?

Thrakkorzog:

Now, now, now…there'll be plenty of time for brain-eating after we conquer the Earth!
Cloning is a precise science…that's why I use the clonerizer…it costs more, but you get what you pay for.