The overview section is for a summary, gameplay details belong in the gameplay section
The mission starts off with Jane Austen doing a short narration setting the scene for the DLC, before transitioning to The Ship. The Saints are setting The Ship up for Christmas, but The Protagonist refuses to help, which prompts Shaundi to call them a Grinch. The Boss is questioned by Shaundi, Pierce, Matt Miller and Kinzie about if he cares about anything Christmas related, but then The Ship gets shakes about and Kinzie points out that it's not an attack. A purple energy field appears and reveals a Future version of Shaundi with cybernetic implants, who claims that Clawz is coming, and that he's a warlord from her time and the present-day Saints future. When The Protagonist goes to confront Future Shaundi for not going back in time to stop Zinyak's invasion, Future Shaundi quickly arm-locks and incapacitates The Protagonist, warning them that Clawz is a serious threat, which makes The Protagonist stand down and is released. Future Shaundi would go on to say that Santa had be trapped for decades, and that he needs to be saved before time runs out. The Protagonist would later be pushed into dealing with the situation after they claim it to be stupid.
The Protagonist and Future Shaundi appear in a Christmas version of 50s Steelport, with The Protagonist criticising Kinzie for the sweater they are forced to wear, although Future Shaundi remarks that they have to wear what they must to help bring back Christmas, and tells them to go to the shop. The Protagonist breaks in and steals the Crimson Cowboy BB gun, which triggers Clawz to appear and turn people into Gingerbread Men, which try to attack The Protagonist and Future Shaundi. Despite Future Shaundi warning The Protagonist not to attack Clawz with the Crimson Cowboy they ignore her and gets shot in the eye.
Future Shaundi then spots Santa and is revived by The Protagonist, asking him about thin he looks, he mentions how the Christmas spirit does not exist anymore thanks to Clawz, and says that they have to start of by ringing the bells around town. The group proceeds to do this but Santa notices Future Shaundi's anger and hatred, promoting him to try and calm her down, which surprises her that Santa knew her name and helps calm Future Shaundi, and would explain that her hardened attitude was due to the war with Clawz, with Santa telling her that there might be a hack sack under her tree for her and cheers her up. With Santa fighting alongside the Saints, The Protagonist rings the bells and progressively restores their Super Powers and Santa's while granting Powers to Future Shaundi, before they go after a projector. The Protagonist gets the projector but still continues to show no care about the situation, promoting Future Shaundi to call them a Grinch.
When the projector gets set up, it brings Clawz's Sledge down but Clawz is still protected due to the lack of power being supplied to the projector, in which CID agrees with and tells the trio to head to the town hall and protect him while he helps out. Future Shaundi asks Santa about the situation with the North Pole and he explains how Clawz has turned Twinkle against him, mildly agitating Future Shaundi as she bring up how he took her arm, although Santa assures her that Tinsel and the elves have set up a resistance and that Mrs. Claus will be fine.
CID finishes up and tell The Protagonist that they are needed up on the roof to make the plan work. He then tells The Protagonist to lick the pole, making them swear and Future Shaundi scolds them before they decide not to lick the pole. CID then decides to dare them and they lick the pole, electrocuting them and restoring power to the projector. The trio goes back to Clawz and incapacitates him, but before he can be finished off, Clawz escapes and Santa tells the Saints they need to go to the North Pole and stop Clawz.
Shaundi telling The Protagonist not to shoot Clawz or risk getting your eye shot out is a reference to the film A Christmas Story in which the protagonist asks Santa for a Red Ryder BB Gun and is told "you'll shoot your eye out, kid". The film is further referenced in how Shaundi lost her eye with the Crimson Cowboy BB Gun when she shot RoboRudolph.
The objective to lick the electrical pole is a reference to the A Christmas Story, in which one character 'double dog dares' another to lick a frozen flag pole, and gets his tongue stuck to it.