In this episode, Marcy takes drastic steps to bring back the memories she lost in the reset, and the show does a drastic retcon of her origin story. While Marcy is taking her ice bath through memory lane, the rest of the team is charged with helping to protect future POTUS 53, currently a sweet little girl under attack by the Faction. When you’re an evil death cult, it’s never to early to assassinate a president.
Marcy begins her ice bath ritual with a quasi suicide note for David, because this show loves to torture him. Not that I mind all that much, since David’s happiness is frequently based on guilting people into doing what he wants. He’s one of those guys whose excessive sensitivity makes every situation about him, and Marcy’s need to recover her past is, of course, actually about his needs instead of hers.