Star Trek is populated with many different alien species. Some encounters it seems like you better just pray that the kill setting on your phaser is strong enough to zorch the life out of them before they can melt your face off. Others you can reason your way out by using diplomacy or good times in the holodeck. Here's a list of some memorable, or not so memorable races that are ranked on that continuum.
1 53 VOTES
e.g. Third of Five (Hugh), Seven of Nine, Borg Queen, Crosis.
46 7Agree or disagree?
3 47 VOTES
e.g. Captain Koloth, Duras Sisters, Worf.
36 11Agree or disagree?