Martha and Nat eating Krabby Patties at the Krusty Krab.

Martha Smith is a minor character that appears in the series Spongebob Squarepants (T.V. Series). She is one of the more notable background fish in the series. She appears most frequently at the Krusty Krab. She is also seen in Bikini Bottom in various crowd scenes. In Suction Cup Symphony, she is seen playing the harp in Squidward Tentacles's performance. She is also employed as a nurse in several episodes as well. She first appeared in Pickles and has appeared many times afterwards. She is voiced by various actresses.