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Title: Something Rotten on Berserker Island (25 Aug 2017)
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| Episode cast overview, first billed only: | |||
| Jay Baruchel | ... | Hiccup (voice) | |
| America Ferrera | ... | Astrid (voice) | |
| Christopher Mintz-Plasse | ... | Fishlegs (voice) | |
| T.J. Miller | ... | Tuffnut (voice) | |
| David Faustino | ... | Dagur (voice) | |
| Lucas Grabeel | ... | Gustav (voice) | |
| Zack Pearlman | ... | Snotlout (voice) | |
| Paul Rugg | ... | Savage (voice) | |
| Andree Vermeulen | ... | Ruffnut (voice) | |
| Mae Whitman | ... | Heather (voice) | |
 |
Steve Alterman | ... | Additional Voices (voice) |
|
|
Wendy Cutler | ... | Additional Voices (voice) |
| Kyle T. Heffner | ... | Additional Voices (voice) | |
| Paula J. Newman | ... | Additional Voices (voice) (as Paula Jane Newman) | |
| Jim Pirri | ... | Additional Voices (voice) | |
Hiccup and the gang are invited to Berserker island by Daggur, only to find their dragons acting strange on the island. So when they are attacked by dragon hunters, the gang has to take them on alone, without their dragons.
