M-3M4CanonLegendsInfinities M-3M4 was introduced in the 2022 novel Brotherhood, which was written by Mike Chen. Behind the scenes M-3M4 was introduced in the 2022 novel Brotherhood, which was written by Mike Chen. AppearancesBrotherhood (First appearance, simultaneous with Brotherhood audiobook) (Unknown)Unknown UnknownNoneBrotherhood audiobook (Unknown)Unknown UnknownNone