Lurking Danger.
Uncomfortable Glance.
Unknown Dread.
Dark Shadow.
Ominous Threat.
Unwelcome Stranger.
Dangerous Intruder.
Unwelcome Guest.
Stubborn Squatter.
Entitled Demander.
Abusive Spouse.
Entangling Spider.
Blood-sucking Leech.
Pimping Drug-dealer.
Cannibalizing Monster.
Dung Shoveler.
...