The Tick vs. Dinosaur Neil is a classic episode that provides much of the footage used in the opening credits of the show, including The Tick rescueing Arthur from Neil's mustache and The Tick wrestling Neil's tongue. The whole problem is caused by Neil accidentally eating some dinosaur DNA he was trying to grow into a dinosaur (quote Neil "I saw it in a movie!"). After eating the sample, Neil grows into a 180 ton dinosaur and terrorizes The City until Arthur discovers his hidden weakness...

This episode also features some great dialog when Dot comes to visit The Tick and Arthur. Initially, Dot doesn't approve of Arthur's new superheroic lifestyle, but after she sees Arthur and Tick save The City from Neil, she relents (and gets chummy with the rehumanized Neil to boot...)

Tick escapes Neil's mouth

This episode features these Superheroes:
The Tick, Arthur, Die Fledermaus, Caped Chameleon, Bi-Polar Bear, Captain Lemming, Human Bullet, Fire me Boy and Sewer Urchin.

This episode features these Supervillains:
Dinosaur Neil

Tickisms

The Tick:
Staring out over the city he is sworn to…to…start out over!
I will suppress my every urge!
I never knew I could learn so much…now just to retain it!
Fireworks? Extinction? Keen!
Ohhh!!! The Stink of it!
Dot! you look lovely tonight! Your hair is like a halo of mouse-brown fire!
The mustache of a titan!
Arthur! fight that wild hair!
You can't chew me away!
OH beware the other head of science, Arthur! It bites!

National Guard General:
Looks like your friend's being devoured!

Sally Vacuum:
The tick appears to have been devoured in one of the most selfless acts this reporter has witnessed.

Dot:
Dad really messed you up, didn't he?

Mayor Blank:
The national guard says they won't come unless the dinosaur is officially rampaging.

Professor in wheelchair:
liar! liar! pants on fire!