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 "Friend or Foe (SpongeBob SquarePants)"): It was written by Casey Alexander, Zeus Cervas, Mike Mitchell, Steven Banks and Tim Hill, and the animation was directed by supervising director, Alan Smart and Tom Yasumi.
Relevant evidence: No