A Summons to Debtor in Involuntary Case is a legal document issued by a court or other authority to a debtor, requiring them to appear in court to answer a creditor's complaint. In an involuntary case, this document is used to start a court proceeding against the debtor without the debtor's consent. There are two types of Summons to Debtor in Involuntary Case: a Summons of Original Process and a Summons of Supplemental Process. The Summons of Original Process is the initial summons issued by the court to the debtor, notifying them of the complaint and ordering them to appear in court to answer the creditor's complaint. The Summons of Supplemental Process is issued after the Summons of Original Process, and requires the debtor to appear in court to answer additional questions or to provide additional evidence. This document is issued when the debtor fails to appear in court after being served with the Summons of Original Process.