1x12 - Captain N: The Game Master

Mother Brain tricks the N-Team into thinking she's been defeated. She then opens up a warp zone, with Kevin's neighborhood shown on the other side. Thinking it's the Ultimate Warp Zone, Kevin goes through. Mother Brain captures the remaining N-Team members and sentences them to banishment in the Black Hole Warp Zone. Kevin, who's really on Metroid, finally gets back to the Palace and rescues the N-Team.