Each numbered story in the "Solid" series has had a group calling themselves "sons". Here is a list of those groups, and which story they're from.
Each numbered story in the "Solid" series has had a word that represents the overall concept. Here is a list of each story's word, and the second "hidden" meaning.
MEME (Metal Gear Solid) Noun 1. meme - a cultural unit (an idea or value or pattern of behavior) that is passed from one person to another by non-genetic means (as by imitation); "memes are the cultural counterpart of genes"
GENE (Metal Gear Solid 2) Noun 1. gene - (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors"
SCENE (Metal Gear Solid 3) Noun 1. scene - the place where some action occurs.
SENSE (Metal Gear Solid 4) Noun 1. sense - a general conscious awareness; "a sense of security"; "a sense of happiness"; "a sense of danger"; "a sense of self"
The Metal Gear universe is connected to two other games by Hideo Kojima.






Meryl Silverburgh appears in Policenauts, as well as Metal Gear Solid, and Metal Gear Solid 4.






Many themes from the series are repeated as an homage to previous games, here are some examples.

