Question: What is the first episode of the fifth season and the 81st overall episode of the American animated television sitcom "SpongeBob SquarePants" where Sirena Irwin voiced Mama Krabs?
Sentence (from "Sirena Irwin"): In 2011 she premiered the role of Lucy Ricardo in "I Love Lucy: Live on Stage" in Los Angeles, and has toured with that show for several years.
Relevant evidence: No