Eve and Gavin agree to help James. Izzy is mad they all gave up on Levi.

Ella helps make a water tower. They hear an awful noise underneath.

Riley and Veronica bond while looking for the mapping device.

When the girls return, the Clearing is dead. Scott rushes them to the truck, and a swarm of yellow jackets is invading.

Veronica and Scott realize Ella is alive on the ground. Riley suggests getting the epi-pen from the bus.

Ty tries to reason with Kira, and Sam tries to reason with Levi.

Ty catches up with the group at the secret door. As soon as they enter, Levi knocks out the guard and steals his key. James has Gavin use his access while Gavin and Ty lock the doors manually.

Izzy and Josh find that Levi attacked Sam. Izzy runs towards the Lazurus to stop him. Gavin finds Levi in the control room with explosives.

The trio made it to the bus but had difficulty finding the epi-pen. They hook up a hose to the water tower to quiet the wasps.

Veronica got Lily to the storage area but dropped the epi-pen when the wasps awoke again. Ella is convinced she will die.

Scott and Riley save the day, only to realize both sisters were stung, and there's only one epi-pen.

Ella begs Veronica to use the epi-pen and live a better life. The sisters share a heartbreaking goodbye, and later, Riley comforts Veronica.

Eve grows worried about Gavin and Ty. She confronts James when she learns he's still uploading Project Blue Moon, and he attacks Eve.

Izzy arrives to change Levi's mind, but there's a failsafe on the bomb. As everyone runs, the building explodes.