§ 803.05. Third-party practice
803.05. Third-party practice
(1) At any time after commencement of the action, a defending party, as a 3rd-party plaintiff, may cause a summons and complaint to be served upon a person not a party to the action who is or may be liable to the defending party for all or part of the plaintiff's claim against the defending party, or who is a necessary party under s. 803.03. The 3rd-party plaintiff need not obtain leave to implead if he or she serves the 3rd-party summons and 3rd-party complaint not later than 6 months after the summons and complaint are filed or the time set in a scheduling order under s. 802.10; thereafter, the 3rd-party plaintiff must obtain leave on motion upon notice to all parties to the action. The person served with the summons and 3rd-party complaint, hereinafter called the 3rd-party defendant, shall make defenses to the 3rd-party plaintiff's claim as provided in s. 802. 06 and counterclaims against the 3rd-party plaintiff and cross claims against any other defendant as provided in s. 802.07. The 3rd-party defendant may assert against the plaintiff any defenses which the 3rd-party plaintiff has to the plaintiff's claim. The 3rd-party defendant may also assert any claim against the plaintiff if the claim is based upon the same transaction, occurrence or series of transactions or occurrences as is the plaintiff's claim against the 3rd-party plaintiff. The plaintiff may assert any claim against the 3rd-party defendant if the claim is based upon the same transaction, occurrence or series of transactions or occurrences as is the plaintiff's claim against the 3rd-party plaintiff, and the 3rd-party defendant thereupon shall assert defenses as provided in s. 802.06 and counterclaims and cross claims as provided in s. 802.07.
(2) When a counterclaim is asserted against a plaintiff, the plaintiff may cause a 3rd party to be brought in under circumstances which under this section would entitle a defendant to do so.
(3) Oral argument permitted on motions under this section may be heard by telephone under s. 807.13(1).