M&M's: A Secret WW2 AllianceTwo candy empires secretly joined forces.

From the show

Iconic Names Explained

Discover the wild origin story of M&M's. The iconic candy was born from a strategic partnership between the heirs of two massive, competing empires: Mars and Hershey's. Learn how a patented idea for melt-proof chocolate and access to rationed ingredients during WWII created an iconic treat before it ever hit public shelves.