The Super Sky-Shadow

Hardware builds a giant version of MonStar’s bat and it is constructed as heavy machinery rather than as a creature, so it is filed here and not with the Fighting Hawks. It is destroyed and then rebuilt, and the second outing has the most ambitious plan in the series attached to it: tow the prison itself to BrimStar.

Both episodes in our own data describe the thing. The proper-noun form comes from the fan record.

Sources: the aired episode synopses, thundercats.fandom.