In the Half-Life series, there are fictional alien creatures, known as “headcrabs”. In the YouTuber’s(Katie) house in the video above, there we have, headcat a.k.a Sophie.
Headcrab Cat loves to perch on the head of Katie’s room mate and the Gordon Freeman doppelganger while he plays his computer games, not really affected by the presence of the headcrab cat, Sophie.
[Kotaku]
