The Berserkers are a band of pirates lead by Captain Hammerhand.
The original Berserkers were apparently all killed when their ship was sunk, but Hammerhand was later mystically resurrected by Mumm-Ra, who summoned up his spirit to animate a clone of Panthro which he had created. When the plan failed, Hammerhand's spirit broke Mumm-Ra's control, and the clone body shifted into Hammerhand's original form before departing.
When he next appeared, Hammerhand had reformed the Berserkers with three members endowed with cybernetic bodies and powers like his own.
- The Terror of Hammerhand (humans)
- Spitting Image (Hammerhand only as a spirit)
- ThunderCats - HO! Part 1
- ThunderCats - HO! Part 2
- ThunderCats - HO! Part 4
- ThunderCats - HO! Part 5
- Together We Stand
- LJN Toyline had prototype Berserkers, which were at one point for possible development and shown in materials for characters Cannon-Blaster and Quick-Jaws.