Question: what is name of the first episode of the season of American animated television series "SpongeBob SquarePants" which was aired on Nickelodeon from February 19, 2007 to July 19, 2009, and contained 20 episodes?
Sentence (from "Friend or Foe (SpongeBob SquarePants)"): "Friend or Foe" is the first episode of the fifth season and the 81st overall episode of the American animated television sitcom "SpongeBob SquarePants".
Relevant evidence: Yes