The alien language as seen in the series is actually Esperanto written in an invented right-to-left script. This phrase in season 1, episode 1 translates to "four months ago". Resident Alien premiered its 10-episode first season on January 27, 2021, on Syfy. In March 2021, it was renewed for a second season which premiered January 26, 2022. The second season consists of 16 episodes, split into two eight-episode parts; the second half premiered on August 10, 2022, in July 2022. In June 2024, it will move to USA Network.
An alien sent to wipe out humanity kills and takes on the identity of a vacationing physician. He is asked to do an autopsy on the town's doctor, who has died in unknown circumstances. He develops compassion for humanity over time and ends up having to defend them from other extraterrestrial threats.