These monsters are those that have been created, modified or engineered by design and/or accident.
"Excuse me, uh...hot metal things, but can you tell me how to get to Sesame Street?" Plankton Monster from The Price of Doom
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"No, no! Don't fry us!"..."You think you've got problems, I'm stuck on this thing."from Village of Guilt
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"I can't believe they put me together with duct tape and leftover car parts." Robot from The Indestructible Man
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"I must have put on weight." Protoplasm Monster from Cradle of the Deep
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"It works!"Dr. Jenkins..."Mine are bigger than yours." Dr. Winslow..."I hope the cameras are on."Angie
from The Amphibians
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"At least you three don't have to wear socks over your heads."Generic 'Cyborg'
"I wonder what Nelson's thinking?" Gundi 'Cyborg'
"Why didn't he make me taller?"Nelson 'Cyborg' "Nothing very exciting ever happens here." Tish 'Cyborg' from The Cyborg***
"Gulliver lives!"Dr. Stanley from Leviathon ***
"No, no! Don't dissect me!" Manfish from The Menfish ***
"It's not easy being perfect." Omir the Android from The Mechanical Man***
"At last, a cure for psoriasis." Capt. Wren and Friends from The Fossil Men***
"Uh, Doctor? I think the corpsman overdid things." Mummy from The Mummy***
Adam and Morton from Fires of DeathWho says Voyage never got a golden oscar?Oops, sorry, Emmy.Oops sorry again, wrong gender.***
"ONI sure puts out great disquises!" Prof. Paulsen from Abominable Snowman
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"Okay, who stole my flea dip?"Crane..."Is there a dentist on this sub?" Dr. Braddock .. from Man Beast
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"Eat meat, not me!"Mutant plant monster from The Plant Man