13.08 Additional parties may be brought in

Here's a plain English summary of this rule:

If someone files a counterclaim or cross-claim in a lawsuit, sometimes the people already in the case aren't enough to fully resolve that claim. Maybe another person or business needs to be involved for the court to make a fair and complete decision. When this happens, the court can order that person or business to be added to the case as a defendant.

This rule exists so that all claims can be settled properly in one case, instead of leaving gaps that would require separate lawsuits later. It gives the court the power to pull in whoever needs to be there so the counterclaim or cross-claim can be fully and fairly decided.

If you're involved in a case where someone files a counterclaim or cross-claim against you or another party, you might see new people or companies added to the lawsuit under this rule. This is normal and it means the court wants to resolve everything at once, rather than dealing with the same issues in multiple separate cases.