Dee Wallace plays Helen Brown, the matriarch of the Brown family, who takes charge in protecting her home from the Critters.
M. Emmet Walsh portrays Harv, a local sheriff who gets involved in the chaos caused by the Critters.
Billy Green Bush takes on the role of Jay Brown, the father of the Brown family, who tries to defend his home against the Critters.
Scott Grimes plays Brad Brown, the teenage son of the Brown family who helps in the fight against the Critters.
Nadine Van der Velde portrays April Brown, Brad's older sister, who also joins the battle against the Critters.
Billy Zane takes on the role of Steve Elliot, a charming town resident who gets caught up in the mayhem caused by the Critters.
Lin Shaye appears as Sally, a waitress who has an encounter with the Critters during their rampage.
Ethan Phillips plays Jeff Barnes, a resident of the town who also becomes a target of the Critters.
Don Keith Opper portrays Charlie McFadden, a town drunk who surprisingly becomes a key player in the fight against the Critters.
Terrence Mann takes on the dual role of Johnny Steele, a famous rock star, and Ug, the alien bounty hunter pursuing the Critters.
Jeremy Lawrence portrays Reverend Miller, a religious figure in the town who faces the terror brought by the Critters.
Michael Lee Gogin plays Warden Zanti, an authority figure who also comes face to face with the menacing Critters.
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