The Day Ulysses Disappeared

September 1990.
Ricky, Ulysses, Julia, and Matteo witness a meeting that will forever change their lives. A creature appears before them: green, with a large head, huge eyes, and thin limbs.
Soon Ulysses disappears. The police are searching for him, but to no avail. The answers might be hidden at a nearby military base, where experiments are being conducted on a UFO that crashed several years ago. But alien technologies are incomprehensible... and unruly.
The teenagers will have to face a reality that is collapsing before their eyes: earthquakes, abductions, time travel, crazed animals, adults turned into zombies.
What do the aliens want?
Who is the real enemy here?