Board Thread:Questions and Answers/@comment-28125426-20180527023004/@comment-24520051-20180616202016

I'll give it to you, Shadzane. It was 109, for your information. Their second published collaboration was Showcase #78, though on this wiki it's listed as the following month. Wein claimed that Showcase was published three days later.

This information from the foreword of The New Teen Titans Volume 3.