May 31
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- 1988: The Super-God Masterforce episode "Super Warriors - The Godmaster Brothers" premieres in Japan.
- 1998: Beast Wars: Transformers for the PC is released.
- 2000: The Car Robots episode "Counterarrow's Betrayal?!" premieres in Japan.
- 2006: G.I. Joe vs. the Transformers: The Art of War issue 3 is released in the United States by Devil's Due Press.
- 2006: Infiltration issue 5 is released in the United States by IDW Publishing.
- 2008: The Transformers Animated episode "SUV: Society of Ultimate Villainy" premieres in Canada.
- 2008: The Transformers Animated episode "A Fistful of Energon" premieres in the United States.
- 2009: The fourth and final day of BotCon 2009.
