Shrike (Marvel Cinematic Universe)

"They come from another world. They're called the Shrike. Primal, simple beings. They jump to a new world and infect a host. If the host gets taken out, they go berserk in search of a new one."

- Sarge explaining the Shrike to Melinda May.

The Shrike are the main antagonistic faction in Season 6 of the TV series Marvel's Agents of S.H.I.E.L.D. They are a race of parasitic avian-like aliens that serve their creator Pachakituq and travel throughout the universe using their hosts as energy to destroy planets.

Biography
Over 100 years ago, the Shrike were created by their mysterious being known as "Pachakituq". Serving their creator, the Shrike go around different planets and possess the natives as hosts. Using the hosts' bodies as energy, the Shrike use the energy to expand like crystals and destroy planets. At some point, they became hunted by Sarge and his crew throughout the universe, where they kill the creatures with certain knives specifically designed to kill them.

Eventually, the Shrike were sent by Pachakituq to Earth and began possessing humans. After Sarge's team arrived, they hunted anybody who was a Shrike. After they killed a Shrike, the host's body was brought in by S.H.I.E.L.D. for analysis. After opening up the host's body, the Shrike was revealed to be still alive and flew around the base before taking control of Agent Keller. Just as he being exploded into crystals, Yo-Yo Rodriguez killed the Shrike with the same knife, saving everyone in the base. Eventually, Sarge and Snowflake captured a Shrike-possessed human and had Melinda May kill it to confirm their existence.

Trivia

 * For currently unknown reasons, the Shrike's ability to convert their hosts into energy and expand like crystals somehow resembles the Monoliths' abilities to liquefy and create portals through either time and space.