When a necessary party is missed, the main legal remedy is to ask the court to cure the defect instead of letting the case collapse: the usual step is to file an application for impleadment (for example, under powers similar to Order I Rule 10 CPC in India), requesting that the missing person be added as a party, along with permission to amend the memo of parties, cause title, and prayer so the decree can eventually bind everyone. If the omission is discovered at a later stage or after judgment, parties may seek appeal, review, or remand on the ground that an effective decree could not be passed without that person, asking the appellate or revisional court to set aside or modify the judgment and direct proper impleadment. A defendant who spots non-joinder early should specifically plead it in the written statement and request the court either to direct the plaintiff to add the necessary party or to record that the suit is defective if the plaintiff refuses. To deal with it efficiently, best lawyers don’t wait for surprises: they prepare a stakeholder map (all co-owners, legal heirs, contracting parties, authorities, beneficiaries), check limitation before adding anyone new, move impleadment at the earliest hearing, and ask the court to settle non-joinder issues clearly at the time of framing issues. This approach keeps the focus on curing a procedural defect quickly so the matter is decided on merits and the final decree is enforceable and resistant to challenge.