固蛇（英語：Solid Snake，日語：ソリッド・スネーク，通稱「史內克」（Snake），又譯「固體蛇」或「索利德·史內克」），是系列作另一位主角裸蛇「Big Boss」的複製人，因故身體急速老化後改用「Old Snake」代號，是一位由科樂美的小島秀夫創作的電子遊戲潛龍諜影系列中的虛構人物，同時也是大部分作品的主角。本名大衛（David），姓氏不詳[1][2]。由大塚明夫擔任人物的日語聲優，而英語聲優則是身為演員和編劇家的大衛·海特。4代時的動態捕捉演員為岡本良史。
Quick Facts 固蛇, 首次登場 ...
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初登場時，史內克是一名隸屬於FOXHOUND部隊的間諜、僱傭兵和特種行動士兵，並由玩家控制，需透過經由無線電中的指揮人員和專家來單獨行動。後來在遊戲中提到他還是孩子時就身在戰場（和綠扁帽潛入伊拉克）。海報造型是按《魔鬼終結者》中的凱爾·瑞斯（Kyle Reese）設計的。
史內克這個角色已經受評論家的好評，且被評為遊戲史上最受好評的角色之一。但是在《潛龍諜影4 愛國者之槍》中的老態則引起了各種各樣的反響。
在他出場亮相時，史內克的視覺外觀是引用流行的演員。據考證是以John Carpenter的漫畫《Snake Plissken Chronicles》的主角大蛇·普利斯金（該漫畫曾改編成兩部電影，《紐約大逃亡》及《洛杉磯大逃亡》），以及《第一滴血》的主角約翰·藍波為原型（三代中的主角史內克也就是Big Boss也參考此二人）。這樣的設計顯示了他作為一個棕色頭髮、身穿深色西裝的成年男人。這個外觀仍大多是一致的整個後續地分支，有因他的年齡推進而改變。《潛龍諜影2 自由之子》中，他化名為Iroquios Pliskin偽裝成隸屬於海豹部隊的海軍中尉。在《潛龍諜影4》中他經歷了一個明顯、急劇的變化，他的加速老化讓他看起來更接近老人。儘管如此，他仍然穿著他的西裝執行任務或不同的偽裝，看起來像其他的角色或年輕的自我。
本名David，是愛國者藉由拿取Big Boss五十五歲時的基因，以上了年紀的Eva身體作為代孕，透過人工創造最強士兵計畫「恐怖之子計畫（恐るべき子供達計画／Les Enfants Terribles）」所製造出來的複製人，因此身體細胞急速老化。智商達180，精通六種語言，包括英語和法語。他大多數的生活都在戰場上[3]。前FOXHOUND成員，曾參與並解決「世外桃源反叛事件」（Outer Heaven Uprising）及「贊給巴爾之亂」（Zanzibar Land Disturbance），在兩次事變中摧毀了Metal Gear及Big Boss的野心而拯救世界，得到「傳說中的傭兵」這稱號。退伍後在阿拉斯加隠居，之後因「暗影摩西島事件」（Shadow Moses Incident）而被迫再次參與任務。事件後，加入了反Metal Gear組織「Philanthropy」（博愛），在世界各地參與反Metal Gear運動。作為一個剛強的老將，他將自己的情感埋得很深。每次任務都有不同的動機[4]。他被認為是一個孤獨的人[5][6]。他表示嚮往軍隊和國家就是自己的一部分[7]。隨著這些特質，他有一個更人性化的一面，即會調侃和奉承女性[8]和犧牲自我[9]。用堅定的信念，即使在戰場上展現出友誼[10]、愛[11]，仍可大顯身手，且暴力不值得光榮[12]。不過史內克的暴力知覺似乎是被否定的，作為他的敵人或夥伴至少有一人稱，說實話，他喜歡殺人，並標記他比他殺掉的人更邪惡[13][14][15]。
最後在Otacon、Sunny、Eva和奧塞羅特（Ocelot）的幫助下摧毀愛國者組織，然後和Otacon一起退隱，享受餘生。
老菸槍，在《愛國者之槍》中還會用攜帶式的菸灰缸。外表冷酷沉著，但其實挺喜歡女性，在作戰中有時還會挑逗女性。
在屬於FOXHOUND的時代中，就是空降部隊、水肺潛水和攀岩專家，此外還會近距離戰鬥術（CQC）。武器方面大多使用槍械類為主。
從《火線獵殺：野境》中的特別任務 [守護者]中，得知他已經退休。
Metal Gear Solid, Konami Computer Entertainment Japan (1998).
Meryl: "So... where to, Snake?" // Snake: "David. My name is David..." // Meryl: "Okay, so where to, Dave?"
Metal Gear Solid 4: Guns of the Patriots, Kojima Productions (2008).
Big Mama: "My, how you've grown... David..."
Roy Campbell: ...You were there too I believe. Didn't you infiltrate western Iraq with a platoon of Green Berets? Snake: I was just a kid myself back then. (Metal Gear Solid)
Colonel Campbell: [Solid Snake], there's enough dirt in your file from your days as an agent to keep you in the stockade until you're a very old man.
Snake: Right now my fifty huskies are my only family. I've got to take care of them. (Metal Gear Solid)
Meryl Silverburgh: Is there anyone you like? Solid Snake: I've never been interested in anyone else's life... Meryl Silverburgh: So you are all alone. Just like Mantis said. Solid Snake: Other people just complicate my life. I don't like to get involved. Meryl Silverburgh: You're a sad, lonely man.(Metal Gear Solid)
Solid Snake: I told you, even if I do owe you I don't owe anything to this army or this country!. Colonel Campbell: You will accept this assignment! Solid Snake: Why should I be stupid enough to do that? I'm no patriot. (Metal Gear Solid)
Solid Snake: ...I just didn't expect a world-class designer of military technology to be so...cute. Mei Ling: You're just flattering me... Solid Snake: No, I'm serious. Now I know I won't be bored for the next 18 hours. (Metal Gear Solid)
Naomi: ...Why did you go so far out of your way to save her? For Campbell's sake... or... maybe it's because you like her? Solid Snake: I don't want to see any woman die right in front of me. Naomi Hunter: Oh really? Since when did anybody's death bother you so much? Colonel Campbell: Naomi! It's true that [Solid Snake] has killed a lot of people, that doesn't mean he doesn't have a heart. (Metal Gear Solid)
Naomi Hunter: ...Friends? Solid Snake: ...Frank Jaeger Naomi Hunter: But... didn't you try to kill each other? Solid Snake: That's true. We did. In Zanzibar. But it was nothing personal. We were just professionals on opposite sides, that's all. Naomi Hunter: And you still call yourselves friends? Solid Snake: Hard to believe? War is no reason to end a friendship. (Metal Gear Solid)
Otacon: I wanna ask you... Do you think love can bloom even on a battlefield? Solid Snake: Yeah...I do. I think at any time, any place... people can fall in love with each other. (Metal Gear Solid)
Vulcan Raven: Rejoice, Snake! Ours will be a glorious battle. Solid Snake: This isn't glorious. It's just plain killing. Violence isn't a sport! (Metal Gear Solid)
Solid Snake: It's only when I'm cheating death on the battlefield. The only time I feel truly alive. Meryl Silverburgh: Seeing other people die makes you feel alive, huh? You love war and don't want it to stop... Is it the same with all great soldiers throughout history?
Meryl Silverburgh: You monster! Snake: Let him talk. He doesn't have much time left. Psycho Mantis: I've seen true evil. You Snake. You're just like the Boss... No, you're worse. Compared to you, I'm not so bad.
Solid Snake: I don't want that kind of world! Liquid Snake: Ha! You lie! So why are you here then? Why do you continue to follow your orders while your superiors betray you? Why did you come here? Solid Snake: ...... Liquid Snake: Well... I'll tell you then. You enjoy all the killing, that's why. Solid Snake: What! Liquid Snake: Are you denying it? Haven't you already killed most of my comrades? Solid Snake: That was... Liquid Snake: I watched your face when you did it. It was filled with the joy of battle.
