Who is Chris Diamantopoulos, you say? Let’s just say that he’s someone you’ve seen across many screens but whose name escaped you. He’s kind of “that guy,” a consummate character actor who can do both comedy and drama—and who killed it on the comedy side this year on “Episodes” as a deranged network executive. His funniest scene was when he unveiled his plan for the network, which included killing off reality stars and then breaking the news first on the net’s affiliated 24-hour news net. Genius? Perhaps. Hilarious? Absolutely.