Rom Vs. Transformers: Shining Armor by IDW Publishing

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IDW launched this limited crossover series in July, 2017. The series introduced Stardrive, a Cybertronian Solstar Knight! Written by Transformers guru John Barber with Rom's Christos Gage as the co-author, this story was set during the war, in-universe, but well before the "current" events of the ongoing Transformers titles than ran concurrently. Fan favorite Alex Milne handled the line art, with colors by Josh Perez.

While a fun story that helped set up the eventual Unicron finale mini-series, the last issue of the series sold so poorly that its sales were not reported by Diamond, meaning it was outsold by at least 300 other comic books in its month of release. For context, Seibertron.com's staff is unaware of any other Transformers titles where this applies.