Kimberly Drummond is a fictional character on the popular television series, Diff'rent Strokes, and was portrayed by Dana Plato from 1978 until 1986, near the end of the show's eighth season.
Kimberly wasn't in the opening credits in the 7th season nor the 8th season, however, in the 8th season, there were clips of her and she is shown in the last frame of the opening credits for the 8th season.