A portal to another dimension opens- releasing bizarre and potentially hostile creatures into a populated area.
Establish a secure perimeter around the portal- using crowd control measures and non-lethal deterrents to contain the creatures and prevent further incursions.
Analyze the creatures' physiology and behavior to identify weaknesses and vulnerabilities. Develop containment methods or traps based on their biological characteristics.
Create a communication system to attempt contact with any sentient beings from the other dimension- seeking a peaceful resolution to the situation.
Evacuate the affected area- providing shelter and medical aid to displaced persons. Establish emergency response teams to deal with creature attacks.
Seal the portal using a combination of high-energy fields and physical barriers- risking travel through to the other side to close it from its origin if needed.
Sky tears open wide-Strange whispers- shadows emerge-Courage finds a way.