So, I have often thought it was a fun idea that Jack O'Neill could be MacGyver in hideing. I am well aware of the differnces but there are more similarities. I have have conversations and have read stories that try to merge the two but often have a couple of holes in the theory. So, I have come up with an idea that is loyal to both shows and helps merge the idea of both for those who are interested. I may forget a couple of ideas in this initial post but don't worry I'm sure It'll all come back to me. In the mean time, based on both histories, here's my plauseable merging.

MacGyver's life includes everything we've been told. However, its the stuff inbetween that we can merge with his Jack like.
During his time in the military he, at some point, switched to the Airforce(my father did this. He went from the Marines to the AirForce). Maybe for his curiosity to space or because he hoped to avoid being a ground soldier. During this time he was probably sent undercover on missions and had to come up with different identies ala Dexter. One of these was Jack O'Neill. He probably prefered to be someone else when he had to carry a weapon anyway. MacGyver or not, when your in the military you have to be able to carry and fire a weapon so that part was unavoidable not to mention the harder things during a black ops mission. Through the years when he had to do some black ops missions for the government he went by Jack O'Neill and kept his rank. During one of those missions he met certain women in his life and one of them was Sara. They dated on and off through the years but since he had to go back to his real life there was never anything solid. Prior to when we first met MacGyver in late 85 he had been on a botched mission over Iraq/Iran where he had his parachute mishap and was taken prisoner with head injuries(Solitudes, Matter of Time). He eventually was well enough to escape. He was doing well with Sara at the time so when he refers back to that time he keeps up the story of him being married to her by then. The following years were pretty calm for him on the O'Neill side other than the occational training excersise to keep up the persona and fulfill his military obligations.
This is where it get interesting: During the last year or so of MacGyver you'll notice MacGyver was getting frusterated in the world and paranoid/obsessed over Murdoc. By itself, no big deal but once S.A.M. showed up it gave him a reason to give up the life of a troubleshooter.

Then something bad happens, He realizes Murdoc is still out there and will come after S.A.M. so Mac has to make a really tough choice and give up his life as MacGyver and go into hideing as Jack. He still saw S.A.M. and Pete until he passed away but they were the only people outside the military who knew where he went. As he took on the life of Jack full time he runs into Sara again who lost her husband and Jack marries her and adopts Charlie as his own. Years pass until the tragic accident with Charlie and his gun. That breaks Mac not only for the obvious reasons of loseing Charlie but because it happened with a gun, HIS gun. He becomes bitter, depressed, suicidal and during the dark times he completely gives up on his good habits and,perhapes in an attept to be someone else, does things he would never have though to do before like drink and smoke. What did it matter when he gave up on the world. So then the Stargate movie plays out as is. Once Daniel reminds him of who he is he regains his hope and decides to retire. Then when he gets home he reveals who he truly is to Sara and she devorces him for being lied to for so long on top of Charlie dying. Then a year later when the Stargate starts up again he goes back into action. Other than Hammond and higher ranking officails no one knows who he really is and when Carter makes a MacGyver reference he knows he can't reveal who he is even if he wanted to. Up until The Fifth race he resists the urge to use his brain and acts dumb in the hope of concealing who his is but also subtley nudges Carter in the right direction when need be. He also keep some of the habits he had picked up such as drinking the occational beer esecially when company is over. He realizes talking won't stop the Goau'ld and accepts that he needs to use a gun most of the time.

Then, when the Asgard take away his ancient knowlege during the Fifth Race they take a little too much and from that point on Mac can't concentrate in his special way to come up with his MacGyverisms. This frustrates him everytime he thinks of it since it's who he really is. He stays that way until Season eight when after Lost City they give him back his entire intellegence. It would also help explain why the Asgard saw Jack as the exceptional member of the human race. His mind is more advanced than most. I think that covers it...I think:) I'll jump back on if I think of anything else.
I hope this helps anyone who wants to pretend with me:)

I can see MacGyver becomeing Jack, but would Murdoc keep a closer eye on him since MacGyver is trying to hide from Murdoc.
I think Murdoc would see this as a cat and mouse game.

Maybe, Who knows? I'm just trying to tie the two together. What happends after that is up to anyone. It would be a great reason to tell the story and have Jack have to revel to his team that he's really MacGyver.

Since I never really watched SG-1 the story sounds complicated. I prefer my way than and sees them as seperate characters. It's also very interesting what you can do than. Read my When The World Changes. MacGyver getting military training from O' Neill, they go to World War II together, are captured together, learning to be depend on each other and in the end getting a very solid friendship.

Have you thought about writing a fanfic like this? The premise sounds intriguing enough.

Acually, Yes I have:) I just had to figure out all of that back story to have it make sense. The hardest part was figureing out how to explain Charlie and why Jack didn't "MacGyver" his way out of trouble in certain seasons when there was no other way. That's when I figured Mac adopted Charlie and the Asgard accidently mesed with Mac's mind for those few years and now his creativity is back to the way it was:)
I hope others also use this as a format for their own fan fic:)

I really like your idea! By the way, does anyone have a timeline on Jack per SG-1, like we have for MacGyver? Setting them side by side might help explain things better too.

It's pretty vague before his time with SG-1. They say he did a lot of black ops stuff and the only missions they refer to are before 85 which helps when merging both shows together. I remember watching SG-1 episodes for the first time and takeing mental notes at the few things that would clash with what we knew of Mac before and then working on a way that it would logically work out. Maybe it came from my need to know what MacGyver was doing since 92:) Since RDA uses himself as the model for the majority of both characters it's amazing how easily most of the history and personality traits match.

Mac as Jack? Hhhmmmm... Could be possible, but don't you think Jack Dalton would have tracked him down half way across the galaxy and "borrowed" his living room furniture?

Kev

Maybe Maybourne is actually Jack Dalton!

Oh, I wouldn't insult Dalton that way:) They may be related however. LOL

I get reminded of this possibillity whenever I see Jack wear an item of clothing Mac had thanks to RDA useing his own wordrobe on both shows.

Actually, the idea has been done at least a couple of times. If you look for Stargate/MacGyver crossovers on fanfiction.net, you'll find them. I remember that "My Asgard Father" pretty much followed exactly the idea you've sketched out.

For me, it falls apart on several key points; here's one of them, relatively minor but logisticallly intractable:

Jack, short hair: military requirement.
Mac, long hair: canonical.

Unless Mac/Jack has a button in his stomach that makes his hair grow longer and shorter at will, the two personas cannot coexist. The fanfic I've read that equated them ignored this issue, along with several others.

I did like the notion in the one cited that the head injuries Jack suffered in Iraq caused him to lose his MacGyver genius; it made for an interesting take on the notion. Another one had him 'retiring' the MacGyver persona when Sam showed up, because he was tired of leading a double life and didn't want to deceive his son.

I don't think the hair is an issue. During the years we've seen MacGyver he may not have used his O'Neill persona all that much. It may have been the years before and after that he used it so he could have gotten a hair cut and before 85 he didn't need to go so short for his O'Neill identity. Only when he went into hiding after 94 could he have decided to go so short.

Some of the fan-fic I've see is ok. Most stumble connecting some of the dots. I'll check olut the one you mentioned:)

I remember in some fan fiction web page see an episode where appear Mac and Jack. I remember an episode of The Charlie´s Angels where mixed 2 old TV shows from the 70´s (The boat of love and The Charlie´s Angels). How would be mix Stargate and Macgyver? Jack and Mac?

I don't know about the whole Mac is Jack thing. When I first started watching Stargate SG-1, I remember thinking how wierd it was to see Jack doing everything Mac didn't. But I think the idea is neat with all the background info you put in, it makes it more believable.

Thanks so much. I always loved that RDA was excellent at bringing the wonderful qualities that they both share to both characters:)

I'm of the two separate characters school of thought.

I have a huge fanfic actually written that deals with this premise but in need of serious editing and with a few holes to fill that deals with this same issue.

Since we know that MacGyver was born on January 23, 1951 and Jack O'Neill was born October 20, 1952, we know they can't be the same person in canon. (In your premise, we can assume at least one false birthday, though, so your plan floats, too. You just have to build your world, etc.)

Anyway, for me, this is explained easily by the Korean War.

I postulate that Mac and Jack are actually brothers. Could be full or half, depending on your preference.

Full: mom gets pregnant, dad goes off to Korea and goes MIA. Mom puts baby up for adoption (though Mac never finds that out). Dad later found and returns. Mom doesn't tell dad about Mac or they do not fight the adoption that has already occurred. Later, Jack born to same parents. There is time for this, though barely, using the actual dates of the Korean War.

Half: ditto, only dad is actually killed or never recovered and mom has Jack with a different guy.

Since I find the idea of Sam Carter and MacGyver smoking hot, I bring dear Mac into the SG universe for some fun in my fic. One day, I might even post the beast!

(I don't do long fic, as a general rule, as any reader of mine knows...it kills me!)

PS-your Mac using a gun in the military thing?

Kudos. Yes, I believe he's perfectly proficient with firearms. That's all.