May 21
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- 2003: War and Peace #2 is released in the US by Dreamwave Productions.
- 2005: The Galaxy Force episode "Deadly Battle at the Edge of the Aurora" premieres in Japan.
- 2007: You Can Draw Transformers and the updated paperback edition of Transformers: The Ultimate Guide is released in the US by DK.
- 2009: Transformers (Titan) #25 is released in the UK. Transformers Generations 2009 Vol. 2 is published in Japan.

