Chelsea Stevens and Lily McCalin are two drunk teenage girls who are found skinny dipping and setting off fireworks at Jonesy Lake on Day 1. Much to Henry's dislike, they're litter bugs, and leave their empty beer cans everywhere. When Henry finds them skinny dipping, they call him a creep, believing he's spying on them, and flee the scene. When their campsite is trashed (unknowingly to them by Ned Goodwin), they blame Henry and threaten to call the police. Soon after, Delilah calls Henry to inform him the two have gone missing. Many days later, the girls were found and arrested for joyriding when they stole someone's tractor.
For the most part, Chelsea and Lily's personalities appear to resemble those of stereotypical bratty teenage girls just out looking for a good time. Their dialogue suggests that they are rude, immature, and overly irresponsible as they appeared to have no problems lighting dangerous fireworks in the middle of a forest or setting a campfire despite knowing that it was during a dry spell in the middle of Summer.
They appear to be very confident in their own bodies as they exhibited little shame or modesty over stripping down and jumping into Jonesy Lake without a second thought and drinking a truly astonishing amount of beer between the two of them. Curiously when spotting Henry they tried to hide themselves as best they could in the lake, suggesting that they might be more self-conscious when around others they don't know.
When confronted by Henry, they were very disrespectful, accusing him of being a perverted creeper and threatening to call the police on him if he tried to do anything. They were also implied to be very mischievious and not afraid to break the law as they may or may not have broken into the Twin Forks Lookout to steal Henry's bedsheets, cut the ranger's communications wire (though these was implied to be Ned trying to frame them), as well as stealing a tractor.
- Chelsea is voiced by Erin Yvette and Lily is voiced by Nicki Rapp.
- The teens uses the same female model used for scale measuring during development, only with an added ponytail. The model itself is a free scale model, called "Female Base Mesh", created by Eugene Fokin.