What's the stupidest-looking alien of all time?

Back in the days of yore, TV series and movie were often forced to imagine extra-terrestrials with low-tech special effects and limited budgets. Nowadays, thanks to the wonders of computer VFX, we can create anything — and sometimes aliens still look like crap.

Please vote for the worst-looking alien you've ever seen on screen in the comments — and make sure to add a pic so we have visual proof of their crappiness.