A synthetic labourer at the Utopia Planitia shipyards who, on First Contact Day 2385, is subverted along with the other synths, kills his human co-workers and helps destroy the defences of Mars.
F8 is one of the A500 synthetic workers employed at the Utopia Planitia yards on Mars. He appears in the opening flashback of the first-season Picard episode Maps and Legends, played by Alex Diehl.
On First Contact Day in 2385 a small human crew report for a holiday shift and collect F8 from his storage alcove. They treat him as a machine and a butt of jokes, and he responds with literal-minded politeness. Then his eyes flicker, he stops answering, and he begins entering commands that bring down the planetary shields.
When the workers try to stop him he kills them, watches the rogue synth ships begin their attack on Mars, and turns the weapon on himself. The season later reveals that the Zhat Vash engineered the revolt.