  We study the neutralino mass spectra and production cross sections at an
e^+e^- linear collider in superstring-inspired E_6 models. These models are
characterized by the existence of new neutral gauge bosons and singlet Higgs
fields which also lead to an extended neutralino sector compared to the Minimal
Supersymmetric Standard Model (MSSM) or the Next-To-Minimal Supersymmetric
Standard Model (NMSSM). For different E_6 models we develop scenarios with new
light exotic neutralinos which may offer important possibilities to distinguish
between the models.
