Lizzie and Mika were not in the comics, but there were a couple of boys (Ben and Billy) who had a somewhat similar storyline. It was Carl who did what needed to be done in the comics, though.
So this was the episode Andrew Lincoln was referring to when he said “I can’t believe they went there.” That was some intense TV right there.
When Tyreese said, “I forgive you”, I sobbed out loud, lol.