E=MC2 is an agent with R.E.L.A.T.I.V.E.
That rather unwieldy acronym stands for - get ready for it - Real Energetic Legal Aid Teen International Voice Exploiters. [Did that make any sense to you? Me, neither.] Nevertheless, we are told that it is "the most secret Secret Service" and it is run by a man who has on his door "Office of the Big Brain".
Of course the codename for the operative - E=MC2 - is just as bad in its own way. Begs the question as to why give such a strange designation, except for the whole Theory of Relativity which has absolutely nothing to do with the agent or the organization or anything whatsoever in the two recorded adventures we have of this individual. Is or was there an agent named E=MC1?
'E' [my nickname for him] is a Soviet agent. Nothing expressly mentioned the former Soviet Union but since we are shown the leader of that country showing pictures of dead Stalin and deposed Krushchev and ranting about needing to find someway to "keep ahead of the enemy" [the Western world], it's a safe bet.
When we first meet him, he is a tall, athletic man in military uniform with regulation short hair. Once he goes undercover in the West, he is dressed in the very latest mod clothes (except no bell bottoms! Guess they will come around in a year or two). He sports long blond hair under a really cool hat. Later he looks like he has gained a bunch of weight [Western food will do that to you!]
The mission for 'E' is to steal Western music. The complete plan is to appropriate art and books and movies and music but 'E' just has the last part. Since we do not see anything of him past the second adventure, we never learn how successful it was at it.