Sonic: Showa vs. Heisei: Sonic Heroes War is a upcoming film with Showa against Heisei. This will be released by 2017, due to the fact that it will be uneven in 2016. However it was then announced to either December 30th, 2015. On August 14th, 2015, it was cancelled, but rebooted to Sonic and the All-Star War.
Not shown to due to cancellation.