Blackthorne Publishing

Blackthorne Publishing produced 3 issues of Transformers in 3D in 1987. The 3rd issue was to be the first part of a multi-part story, but no further issues were ever made.

Blackthorne also produced a four-issue Battle Beasts comic book. Issues are marginally easier to find than the Holy Grail.

From Teletraan I: The Transformers Wiki, a Wikia wiki.