Transformers: Cybertron
In Transformers: Cybertron the character of Scrapmetal is described as a Terrorcon. The Transformers: Energon character of Scorponok returned as Dark Scorponok.
Also, in the episodes 'Retreat' and 'Assault' in the series, Starscream commands a horde of Transformers (referred to by Optimus Prime as "Terrorcons"). However, these Terrorcons are given no specific character, appearing as generic Transformer bodies.
Read more about this topic: Terrorcons