I just got done watching voyager episode "The Voyager Conspiracy" so this post is somewhat inspired by that episode. The theory is could Shannon O'Donnell actually be Captain Janeway?
They certainly look and sound exactly like the same person. Voyager episode "11:59" takes place in the year 2000, about 4 years after Voyager visited 20th century earth. But Captain Janeway made it back to Voyager so you might be assuming at that point that Shannon O'Donnell couldn't be Captain Janeway except we know that people can be copied from the transporter:
a second transporter beam could have copied Janeway like with what happened Riker.
If it didn't happen this way maybe Henry Starling managed to copy her or Captain Braxton did as his way to get revenge for stranding him in the 20th century so he got her copy stranded too.
In Voyager episode "Future's End" Chakotay and Torres had this exchange about how they would have to find a job and keep a low profile if they were stranded in the 20th century:
TORRES: Chakotay, what if we're stuck here? What if we can't find a way back?
CHAKOTAY: There are still a few isolated places left in this century. We'd have to keep low profiles.
TORRES: We'd have to get jobs.
CHAKOTAY: I've thought about pursuing archaeology full time. Maybe I could teach at a university or work on one of the important digs in Central America. There were still a lot of important discoveries to be made in this century. I could win a Nobel prize.
TORRES: So much for a low profile.
Kind of like the way Shannon had jobs and kept a low profile. When the Defiant went back in time in episode "Trials and Tribble-ations" Bashir mentions the possibility of how a pre-destination paradox could cause someone to become their own ancestor:
BASHIR: No one ever met my great grandfather. This could be a predestination paradox. Come on, Chief, surely you took elementary temporal mechanics at the Academy? I could be destined to fall in love with that woman and become my own great grandfather.
O'BRIEN: You're being ridiculous.
BASHIR: Ridiculous? If I don't meet with her tomorrow, I may never be born.
Unlike in Bashir's case Janeway knew for a fact that she was in a pre-destination paradox type situation when she found out the time ship caused the computer revolution and when Braxton explained the A leads to B leads to C leads to A to her:
Then Captain Janeway falls inlove with Henry Janeway and becomes her own great, great, great, great grandmother.

They certainly look and sound exactly like the same person. Voyager episode "11:59" takes place in the year 2000, about 4 years after Voyager visited 20th century earth. But Captain Janeway made it back to Voyager so you might be assuming at that point that Shannon O'Donnell couldn't be Captain Janeway except we know that people can be copied from the transporter:

a second transporter beam could have copied Janeway like with what happened Riker.

If it didn't happen this way maybe Henry Starling managed to copy her or Captain Braxton did as his way to get revenge for stranding him in the 20th century so he got her copy stranded too.
In Voyager episode "Future's End" Chakotay and Torres had this exchange about how they would have to find a job and keep a low profile if they were stranded in the 20th century:
TORRES: Chakotay, what if we're stuck here? What if we can't find a way back?
CHAKOTAY: There are still a few isolated places left in this century. We'd have to keep low profiles.
TORRES: We'd have to get jobs.
CHAKOTAY: I've thought about pursuing archaeology full time. Maybe I could teach at a university or work on one of the important digs in Central America. There were still a lot of important discoveries to be made in this century. I could win a Nobel prize.
TORRES: So much for a low profile.
Kind of like the way Shannon had jobs and kept a low profile. When the Defiant went back in time in episode "Trials and Tribble-ations" Bashir mentions the possibility of how a pre-destination paradox could cause someone to become their own ancestor:
BASHIR: No one ever met my great grandfather. This could be a predestination paradox. Come on, Chief, surely you took elementary temporal mechanics at the Academy? I could be destined to fall in love with that woman and become my own great grandfather.
O'BRIEN: You're being ridiculous.
BASHIR: Ridiculous? If I don't meet with her tomorrow, I may never be born.
Unlike in Bashir's case Janeway knew for a fact that she was in a pre-destination paradox type situation when she found out the time ship caused the computer revolution and when Braxton explained the A leads to B leads to C leads to A to her:

Then Captain Janeway falls inlove with Henry Janeway and becomes her own great, great, great, great grandmother.
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