Michigan Summons on a Third-Party Complaint is a legal document issued by a court to a third-party defendant in a civil lawsuit. The summons informs the third-party defendant of the lawsuit and orders them to appear in court and answer the complaint. The summons is served to the third-party defendant by a process server or the sheriff's office. There are two types of Michigan Summons on a Third-Party Complaint: a Summons and Complaint and a Third-Party Summons and Complaint. The Summons and Complaint is issued to the third-party defendant by the plaintiff in the case. The Third-Party Summons and Complaint is issued to the third-party defendant by the defendant in the case. Both documents must be served to the third-party defendant, and they have 21 days to respond to the complaint. Failure to do so could result in a default judgment against them.