What happens next?

How to defend yourself in a product liability lawsuit
Determine whether you were served properly.
If the plaintiff didn't follow legal procedures to have the complaint delivered, you can have it dismissed for improper service.
Courts have a particular procedure by which the plaintiff must deliver to you a copy of the complaint and summons so you have official notice that you are being sued.
Generally, the papers must be delivered to you by a person over the age of 18 who is not a party to the lawsuit. The papers also must be delivered either to you in person or to someone who has authority to accept the lawsuit.