6. Armus

From: ‘Skin Of Evil’ (Star Trek: The Next Generation, Season One)

What is it? It look likes an oil slick brought to life by the world’s most evil magician.

Pulsing with malicious intent, Armus doesn’t care about human life – a fact it proves by killing off Security Chief Tasha Yar when she tries to cross it. Everyone cries.

Cheesy or cool? Cool. It might look a little dodgy at times, but Armus’ badass attitude gives it massive credit in our books.

Kudos to the TNG team for actually killing off a lead character – even if it was prompted by Denise Crosby’s desire to leave the series.

Bet she wishes she’d stayed on, given how big the show became.

Fact me ‘till I fart: This was no CGI effect. It was a physical suit worn by Mart McChesney, who had no oxygen tank inside it.

That meant shots had to be timed so that McChesney didn’t suffocate under the goo. That’s dedication!