NiGHTS, a mischievous and free-spirited Nightmaren, finds himself held captive by his own brother, the stern and disciplined Reala. While NiGHTS is trapped, Reala creates a clone of NiGHTS to deceive NiGHTS' friends and wreak havoc on Nightopia. Meanwhile, NiGHTS struggles to escape and stop his brother's destructive path.