Being new to the Navy herself, Lonnie Henderson was very inexperienced when first touring with the seaQuest. But with her bear Addison by her side, she soon became an integral part of the team. She knew a lot about mechanics from working with her father on the solar power station that he ran, giving her the engineering skills necessary to be the helmsman and chief engineer of the seaQuest.
Although being one of the lowest ranks on the ship, she is often called to be a part of the away teams because of her knowledge. She is very committed, and learned to cope with her fears in battle situations. She had a brief interest in Tim O'Neill, but he wasn't ready for a shipboard romance, so they remained friends. Later she did have a romance with Commander Ford.