Mystery role from ‘The Mortal Instruments’ star Kevin Zegers revealed.

Two new characters have revealed themselves to the shared cinematic universe ofThe Walking Dead.

Jenna Elfman if Dharma went on an apocalyptic walkabout plays Naomi.

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Credit: Richard Foreman, Jr/AMC

Kevin Zegers fromMortal Instruments plays the other.

Then, living up to their name, they swoop in and scavenge all their supplies.

This is also the group behind those mysterious banners Al found lingering around the area.

We still have lots more questions, but lets see how they fit into the grander scheme at play.

We dont pick up with Madison and the others directly after the season 3 finale.

Theresa lotwe dont know.

(A man gets on the loudspeaker to commemorate 365 days in the Diamond.)

Madison is on the top lookout post, trying to get information out of a young girl named Charlie.

It seems she lost her parents and is too traumatized to talk about what happened.

She stayed up all night trying to build a home for Charlie.

Alicia is a bit concerned, but her mother is still prepared to go out on their scheduled run.

Nick is out in their community garden inspecting the turnips with Charlie.

A circle drawn on the map marks the border they all agreed to never cross.

This is a special case.

Nick doesnt want to go on the run; he doesnt want to leave the stadium at all.

Madison mentions to Luciana later as theyre driving, You werent there when I found him, Lucy.

He just needs to feel safe right now.

Victor also refuses to bring his admirer on the trip, condemning Cole to lookout duty.

But quickly, they drive too far out of range and their communications are cut off.

They soon find an abandoned town.

All the food and supplies have been picked clean.

Even the lightbulbs have been snatched and the town is completely void of walkers, which is odd.

Madison and Alicia branch off to search the area, spotting a flag from above with the number 457.

Just around the corner between three large tanks is a car marred by explosive scorch marks.

This is where they believe Charlie came from.

Luciana suggests he ask Madison.

When Alicia radios to Madison to see if she found anything, Naomi gets the jump on Madison.

While the calvary is ready to roll in, Madison tries talking down this woman.

As she prepares to run off with Madisons gun and keys, Alicia, Luciana, and Victor approach.

Naomi is spooked and runs up to the top of a nearby tank.

Then they find out where all the walkers in town have gone; theyve been herded into these tanks.

Nick, meanwhile, is starting to worry.

They want to remain inside, but Nick feels he needs to check.

So Charlie opens the gate and he drives out in a car, only to become stricken by PTSD.

He sees flashes of him pressing the detonator and flames swarming the dam.

The walkers batting their limbs at the car window exacerbate his symptoms and he crashes into a lamppost.

Cole is able to snipe some of the walkers from above so Nick can leave the car.

Thats when Madison and the others drive up for the rescue.

She remains silent and Madison agrees to talk about it later.

She tells them to ditch the car as a caravan of vehicles starts driving up.

The trio get back inside and mobilize their weapons with the others.

He then labels the vehicle with a fresh piece of cloth and spray paints it with the number 12.

The gates open and Madison walks out to speak with their leader, Mel.

She recognizes their flag, but according to him, they didnt destroy the people of the previous town.

Shes the one who has a real knack for finding the good stuff.

He counters with a warning: You just havent been tested yet.

The next morning, Madison is still affected by Charlies betrayal.

Now its back to the present and we have more clarity.

It seems Mels promise came true.