greys, reptilians, nords? what the heck?

okay can someone explain to me all of these alien types and their motives (and if there is any real evidence that they exist) i did a google search and all i got were these cult wacko sites that really told me nothing. to be honest it all kind of silly to me.

[edit on 28-11-2004 by rowsdower]

Their is no evidence thats good enough for some people but anyway.

Grey
Greys are here (in my opinion and as i understand it) to stop their race from getting themselves all killed. They have been cloning each other for centuries, which caused many ailments to be pasted down, in turn causeing the Greys to become a physicly weak race. Then you have two senarios.

1: The Greys abduct us to use our own DNA to patch up their weak diluted DNA.

2. The Greys are breeding hybrids (human alien) to take over from them once they die off. That would also mean that the hybrids would be able reproduce natrauly, another bonus.

Reptillians
Reps are evil (I seriously doubt they exist) and are bad and just want to enslave us for the heck of it.

Nordics
Are nice guys but other than their are a few hundred theories about 'em. Few have evidence to back them up.