Plaintiff dominus litis principle limits forced impleadment third parties civil suits

The plaintiff is the dominus litis of a civil suit and possesses the fundamental right to choose their adversaries and structure the litigation. A third party cannot compel the plaintiff to join them as a co-defendant or co-plaintiff unless they conclusively establish that they are a necessary party without whom the suit cannot proceed. If the plaintiff omits necessary or proper parties, they do so at their own risk regarding the ultimate enforceability of any decree. Courts cannot compel a plaintiff to add a defendant against their wishes to defend the suit, as any resulting decree binds only named parties and does not infringe third-party rights. This doctrine protects the autonomy of the plaintiff to seek remedies against parties of their explicit choosing. Intervention applications by uninvited strangers are routinely discouraged unless an undeniable legal compulsion exists. The principle ensures that litigation remains focused on the primary dispute between the plaintiff and the chosen defendant. Consequently, courts guard against attempts by third parties to hijack or derail plaintiff-initiated proceedings. (NAK Engineering Company Pvt. Ltd. v. Tarun Keshrichand Shah & Ors. | 2026 INSC 8)