- Lope: What kind of bird is it, professor?
- Professor Bromley: Oh, no bird...a giant pterydactyl...a flying reptile. It's been extinct for over 50 million years.
- T.J.: Then what is it doing here?
- Professor Bromley: Precisely...what is it doing here?
- Professor Bromley: I can't go now!
- Tuck: Professor, there's a big lizard back there and he's heading this way. Now get aboard!
- Professor Bromley: Eohippus, if you are one, what are you doing here over 50 million years after you should be extinct. Could be a freak of nature, of course.
- Tuck: Is there any way you can tell?
- Professor Bromley: By checking its origin. If I could prove that this is the genuine article I should undoubtedly receive a knighthood, Mr Kirby, for the greatest scientific discover of the age.
- Tuck: The greatest scientific discovery of the age? T.J. doesn't know what she's got herself.
- Professor Bromley: I'm prepared to pay a guide handsomely.
- Tia Zorina: To lead to you the forbidden valley? No, not for all the gold in the world.
- Tuck: What's this forbidden valley?
- Tia Zorina: From there came the little horse and until he is returned a great evil will fall upon us.
- Professor Bromley: Rubbish!
- Tia Zorina: I tell you, unless the little horse is returned we shall all suffer the curse of hell.
- Professor Bromley: Superstitious clap-trap! There's nothing hocus-pocus about that little horse. Don't you realise, we've discovered a living specimen of the Eohippus.
- Tuck: What, you mean that thing really is an Eohippus?
- Professor Bromley: Of course!...well, naturally we'd have to prove it by scientific research.
- Professor Bromley: Don't you see...we must follow the gypsy trail to the forbidden valley because where there is one Eohippus there must be others. At least two, the sire and the mare, possibly more. Just think what you and Miss Breckenridge could do with a dozen Eohippi?
- Tuck: Well, you don't seem very glad to see me, Champ.
- Champ Connors: About as glad as a dying mule to see a vulture.
- Tia Zorina: He who takes from Gwangi the evil one is cursed.
- Carlos: Only by an old woman's tongue.
- Tia Zorina: I tell you, if he does not go back to the forbidden vally we shall all suffer a terrible fate. My eyes are blind but I can still see the signs.
- Carlos: Keep your superstitions to yourself, old woman.
- Tia Zorina: Fool! One day he will learn to obey the law of Gwangi, or like his brother he will perish!
- Professor Bromley: This circle of mountains, jagged peaks, steep cliffs, could be the perfect barrier against man and the elements.
- Tuck: No wonder they call it the forbidden valley.
- Professor Bromley: Yes, it might be the answer to many things. We shall soon see, Mr Kirby.
- Tia Zorina: It is as I foretold. Gwangi has killed Carlos just as he killed his brother, Miguel.
- Tuck: Well, how d'ya know that?
- Tia Zorina: In a dream I saw it...the great jaws snapping, the riderless horse. He was doomed and so will you be doomed ALL OF YOU unless the evil one is set free!
- Professor Bromley: Balderedash, my good woman, balderdash! He's no more evil than an alligator. The only thing evil about him are his jaws. Spells? He can cast no spells.
- Professor Bromley: In the name of world science I beg you...I implore you to think again.
- Tuck: Later, professor, we've got a show to put on.
- Professor Bromley: A show! A show! But it's disgraceful to think of putting this fabulous creature on display in a cheap circus.
- T.J.: We can do what we like with Gwangi. He's our property.
- Professor Bromley: He belongs to us all, to mankind, to scientific research.
- Tuck: Easy, professor.
- T.J.: You can do your research in the time we give you. You can follow us on our world tour.
- Professor: You must be mad...raving mad. World tour? We'll see what The Royal Society has to say about this.