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Lindsay and Sidney Greenbush (Carrie Ingalls) - 'Little House on ...
Richard Bull (Nelson 'Nels' Oleson) Richard Bull's TV career started well before 'Little House,' with his role as Doc on 'Voyage to the Bottom of the Sea.' After 'Little House' he also appeared in 'Witless Protection' and most recently on an episode of 'Boss.' Bull lives in Chicago with his wife Bobbi Collentine.