A young girl living aboard the Enterprise-D who, as a science fair winner on a tour with Captain Picard, is trapped with him in a turbolift when the ship is crippled in 2368.
Marissa Flores is the eldest of the three children Picard is escorting around the ship in the fifth-season episode Disaster. When a quantum filament strikes the Enterprise, their turbolift drops and jams, and Picard is left with a broken ankle and three frightened children.
To give them something to hold on to, Picard makes the children his crew and appoints Marissa his first officer, calling her Number One. She takes the job seriously, and when he orders the children to climb out without him she refuses to leave him behind.
Together they climb the turbolift shaft to safety, singing Frere Jacques on the way. The children later present Picard with a plaque. Marissa was played by Erika Flores.