In space, no one can hear you watch the Alien movies in order. It might be the perfect organism according to Ash, but the xenomorph's timeline is a bit of a jumbled mess of prequels and origin stories ...

The MCU has had several cool aliens. The Skrulls, the Chitauri, the Abilisk, they all have cool designs and either sharp teeth or interesting powers. But the title of coolest MCU alien is the Flerkens ...