Thanatos VII
Thanatos VII was the inhabited seventh planet in its star system. 

In 2370, a plasma conduit was manufactured on this planet using a new interphasic fusion process, which was later installed on the  at Starbase 84. However, this new process had attracted interphasic organisms, which later infested the ship's crew and made the Enterprises warp core malfunction. ()

de:Thanatos VII
es:Thanatos VII
ja:タナトス7号星
Thanatos 07