Dr Cosmos is one of the two skins released under the Mega Battle part of the Superheroes offer. It could be purchased as part of a coin deal for a limited time in November 2016.
Dr Cosmos could be purchased for $9.99 in a deal that included 16000 coins. It could also be purchased for $19.99 in the “Best Deal!” which included the Omega Blast skin and 50000 coins. This skin was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Mega Battle sub-offer with the Dr Cosmos skin was released again for a limited time in early February 2019. This time the deal that included 16000 coins was lowered to $9.99. The Best Deal was lowered to $9.99 and the included coins were lowered to 30000 .