Isodyne is determined to paint the late Jason Wilkes as a communist spy who destroyed their lab while stealing secrets, but Peggy - of course - isn't convinced and enlists the aid of her old friend, Howard Stark, in her continuing investigations.
Jack Thompson is in from the New York branch of the SSR, trampling over Peggy's work, pushing Isodyne's version of events, and willing to pass on crucial evidence (the nuclear test footage) to Vernon Masters (Kurtwood Smith) because he believes it's his patriotic duty.
Stark recognises the tie pin (identical to the one Dottie tried to steal at the start of The Lady In The Lake) Peggy recovered from one of the goons that attacked her as being from the Arena Club, an exclusive gentleman's club.
Howard organises an over-the-top distraction that allows Peggy to scope out the club, with the idea of placing listening devices, but these end up being somehow jammed.
Sure, Peggy sneaking into the Arena Club's library just as the secret door opened and the Council members came out was rather contrived, but Better Angels had so much other good stuff in it that such necessities can be overlooked.
Not only did we find out that Jason Wilkes isn't dead, but transformed into some kind of non-corporeal entity, but also that Whitney Frost is not only the brains behind Isodyne (her backstory is a spin on the real story of Hedy Lamarr, of course) but also appears to have Zero Matter inside her.
This episode really ramped the comic book/weird science angle of the show.
Then we had Howard Stark making a western movie based on the Kid Colt comic book (which was published by Marvel's predecessor Timely from the late '40s, which allowed for a joke about making films based on comic books) and had Jarvis, at one stage, commenting on being a "disembodied voice" - presaging the JARVIS programme that maintains Tony Stark's affairs in the Iron Man and Avengers films.
Given the rumours this week that Agent Carter may be cancelled after this season, let's hope they are only rumours because this is one of the finest shows of its kind on television at present.