Jeffrey's Secret Experiment Part 1 is the 9th episode in Jeffrey, Jaden & Friends' Storm Adventures Diamond & Pearl.
It's the anniversary of when the monster Godzilla arrived and caused so much destrucion to Manhattan. Jeffrey, Jaden, Hiccup and their teams arrive there to have a good time. But during the trip, Jeffrey has been going to the docks at night for some reason. Will Aqua, Jaden, Hiccup and the others find out what he's up to?
- Hiccup, Astrid, Fishlegs, Snotlout, Ruffnut, Tuffnut, Toothless, Stormfly, Meatlug, Hookfang, BarfBelch, April O'Neil, Casey Jones, Fugitoid, The Shredder, Karai, Hun, Dr. Baxter Stockman and a secret guest star will guest star in this.
- The storyline continues in episode 9 Jeffrey's Secret Experiment Part 2.