EW tracks down America’s favorite extraterrestrials (and their friends) to find out what the cast has been up to since the show went off the air.A bunch of aliens deviously pretending to be humans (Jane Curtin innocent)Credit: EverettWhen 3rd Rock From the Sun crash-landed onto NBC’s lineup in 1996, it didn’t take long for audiences to fall in love with the most delightfully confused aliens ever to masquerade as a suburban American family.Led by…