XENOMORPH TIMELINE
Advent is a short film released in 2017. Its story takes place in 2104, right after Alien: Covenant (2104) and 18 years before Alien (2122). In the Alien movies timeline, it comes after Alien: Covenant In Utero (2104) and before David's Lab: Last Signs of Life (around 2117).
Aboard the hijacked colony ship USCSS Covenant, after the events of Alien: Covenant (2017), the rogue synthetic David sends a transmission to the Weyland-Yutani Corporation on Earth. He explains what he has done since the disastrous Prometheus (2012) expedition: his arrival on Planet 4, where he wiped out the Engineers, and a decade of experimentation with the destructive black-liquid mutagen, including on Dr Elizabeth Shaw, in his quest to continue Sir Peter Weyland's ambitious vision and to create the perfect organism.
David sends a transmission from the Covenant to Weyland-Yutani on Earth, elaborating upon the genetic experimentation he has been conducting on Planet 4.
Credits : Matthew Thorne (Director)