I came across this amusing t-shirt design of extraterrestrials. But I must have a cog missing in my geekwerks; I don't recognize the alien clinging to Kang's helmet.
Okay, I got Kang from the Simpsons, a alien invader from Space Invaders arcade game, Marvin the Martian, Yoda, ET, the Zenomorph (from Alien, Aliens, Alien3, and Alien Ressurection), Spock, ALF.
The one beside Marvin the Martian and the blob-thingy on Kang's helmet I don't know.
Well that explains it. Back in the 80's I binged out on arcade video games, but didn't stay with it. When it comes to contemporary gaming, my geek-IQ is severely lacking.