Gil dives in head first and tries to teach his parents how to let go of ancient prejudices.
Gil is preparing for a date with Lagoona, and he did not expect his parents to try talk him out of it last minute. Exasperated to have this talk again, Gil rejects their claims that sea monsters are ill-mannered and selfish. He recalls the time he and Lagoona took care of an egg and the time Lagoona helped frogs escape death-for-dissection to put strength behind his words.
Next, Gil gets to the accusation that Lagoona can't be trusted on account of her species. Declaring Lagoona the best friend anyone could ever ask for, he recounts incidents with Frankie and Slo Mo in which Lagoona went out of her way to comfort or help them.
Gil's parents are still not convinced, but Gil can't be bothered. He tells them he won't stop seeing Lagoona or cancel the date before leaving his room angrily. To his parents' relief, he comes back a moment later, but to their disappointment, only to get the bouquet for Lagoona he had forgotten. Promising to be back early, Gil leaves his parents to wallow in their disapproval alone.
- Gil's parents have been heard previously in "Desperate Hours", but they have their on-screen debut in "Defending Your Lagoona".
- "Defending Your Lagoona" is the third of a handful of clip shows in Volume 3. The recycled scenes are from "Hatch Me If You Can", "Freedom Fight", "New Ghoul @ School", "Flowers for Slow Moe", and "Abyss Adventure".
- The webisode was originally scheduled to air on July 26, 2012, but instead, nothing aired. It is likely the original air date was cancelled because "Defending Your Lagoona" contains a fragment from "Flowers for Slow Moe", a webisode that had yet to be released back in July - specifically, it is a webisode first released with the "Ghouls Rule" DVD in October.