Althea is still alive - running from zombies, alone until she runs into Martha who has a mission for her - she wants Althea to take a message to Morgan
Althea’s not having that
So, after a scuffle, Martha knocks her out - but does safely deliver Althea (she doesn’t hate Althea because Althea doesn’t help people - she trades for their stories which isn’t the same as help) to the rest of the gang with a video of Martha saying… well the same thing she’s always been saying. Let’s face it, Martha isn’t exactly a person with multiple messages and themes.
But the gangs together and Morgan tells them all about Alexandria and it’s time to head there - but on the way they’re going to Polar Bear’s truck stop so they can pick up boxes and still help people.
Except Morgan wants to help Martha, even though she’s sick, even though she’s dying, even though she continually trying to kill them over and over and over again. Morgan wants to help her and decides to go off alone to do that. John agrees to wait with the rest at the truck stop for 2 days before coming to find him. That gives them time to reflect on moving on, building a new future, making up for the bad stuff they’ve done and for June and John to have an “awww” moment.
Morgan and Martha meet up with Morgan killing zombie James and she’s clearly very very ill, unable to stand and generally sick. He insists on trying to help and offers her medicine and she continually refuses. He forces her into a police car so he can drag her back - while she struggles and fights and resists
He rightly concludes she’s lost someone and she tells him about her dead husband Hank. He tries to tell her how it’s all not her fault she doesn’t have to do this - and Martha isn’t to blame and is who he used to be etc etc etc they’ve been saying the same words over and over since she first appeared
But drama - all of the gang at the Truck Stop are suddenly horrifically ill and awful and call Morgan to say something’s wrong. It turns out that Martha has poisoned the bottled water with antifreeze as punishment for them helping people. Morgan steps on it to try and get back as soon as possible to tell them (his walkie doesn’t have the same range as the Truck Stop’s transmitter) - and Martha drives them off the road.
After the crash Morgan has something impaled in his leg and is all woozy as Martha draws on his face as she does all her prezombies with “Lose someone lose myself” just in case we missed the oh-so-subtle message here. Morgan again tries to save her and she reveals she’s been bitten
She made sure he couldn’t help her. And now he has to kill her to help his friends. He fights her but he’s utterly terrified that if he kills her he will change back to what he was. He’s also afraid that if he loses everyone, suffers another loss, he will also go back to the evil Morgan. This was why he left Alexandria in the first place - he didn’t want to lose more people he cared about and was afraid of what he would become. He refuses to kill her and instead leaves her handcuffed to the car so when she turns she can’t hurt anyone else
Really? She has been BITTEN. This is a point where putting her out of everyone’s misery would be quite reasonable here Morgan
He then staggers off on foot (did he even try to drive the car?), fighting zombies, hobbling, desperately trying to help his friends. He does get close enough to call them and tell them what they’ve been poisoned by - and June knows ethanol is the cure. They have a tanker of that but when they all fight to recover it, working together, rescuing each other, they end up losing it when Althea has to use the Big Guns on her truck to clear out the zombies.
Or apparently lose it