Background information: Just to be clear, this AU will follow the show up until Too Far Gone. The Governor still unleashes his assault but the groups this time are the following:
Rick, after getting beaten up by The Governor, looks for Carl in the wreckage. He doesn't find him. Instead, he runs into Beth Greene, who found an injured Bob Stookey during the fighting. The trio escape the prison, with Beth leading the way.
(Rick, Beth, Bob)
Glenn never left the bus. He is convinced by the Woodburians to stay in order to lead the bus group.
(Glenn and Woodbury survivors (OCs))
Sasha, after looking for Tyreese and anyone else in the group, runs into Lizzie and Mika. The three of them then flee into the forest, with Michonne following closely.
(Sasha, Lizzie, Mika, Michonne)
Carol, after witnessing the fall of the prison, runs into Abraham's trio, who invite her to come with them to D.C. However, determined to find the rest of the group, Carol convinces the trio to help her.
(Carol, Abraham, Eugene, Rosita)
Daryl is just about to leave the prison when he runs into Tara and Lilly Chambler. He is just about to kill them until Tara reveals she saved Judith. With the Chamblers in tow, Daryl heads back to the Greene family farm in order to rest for the night.
(Daryl, Tara, Lilly, Judith)
Carl, Tyreese and Maggie flee into the forest after failing to find their loved ones. With no other options, the trio heads to an abandoned neighborhood to spend the night.
(Carl, Maggie, Tyreese)
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On the way, they will encounter familiar faces (i.e. Joe's group, Gareth and Terminus, Fr. Gabriel Stokes) as well as new faces. Who will survive this time? Who will reach Terminus? What will happen afterwards?
Note: This AU will go pass S4 and into S5 at some point. Who knows, maybe I might have the groups reach Terminus earlier than the show did? You'll have to read to find out.