In Operation: N.A.U.G.H.T.Y., they were tricked into fighting Sector V for the Reindeer System, who had been framed by the Delightful Children from Down the Lane but they realized it was a Secret Santa Surprise Monkey. This particular Rainbow Monkey doll is only available at the Rainbow Monkey Superstore at Christmas Eve, meaning Sector V couldn't have been at the North Pole that day if they got one. Numbuh 5 explains they were at the store all day waiting in line to buy the Rainbow Monkey doll. The Nutcracker then wonders if Sector V didn't do it, then who had the reindeer, realizing that Sector V was innocent, they had help Sector V clear their name.
When the Delightful Children themselves were revealed to be the true culprits, Elfa Strike returned to the North Pole along with Sector V to stop the villains. There, they were confronted by a rival holiday-themed superhero group, the Faculty 4, who represent "Substitute Teacher's Day." After a heated battle, these teachers were subdued and the Elfa Strike Squad and KND succeeded in saving Christmas.
- Wintergreen: A tough guy elf with "peppermintium" claws and bones, a parody of Wolverine.
- Nutcracker: A wooden-headed elf with teleportation powers and a nasty bite, a pun on Nightcrawler.
- Snow Angel: A winged elf girl with power over snow after being pelted by a radioactive snowball, based on Storm and Snowbird (and possibly Archangel).
- Coniferous: A rather tall elf with the power to cover his body in pine needles, a reference to Colossus.
While each member has his/her own set of unique abilities, the Elfa Strike Squad's ultimate ability is the "Twelve Days of Christmas Attack." When used, clouds appear overhead and rain down objects from the original song. The Twelve Days of Christmas Attack stacks up 12 drummers drumming, 11 pipers (plumbers) piping, 10 lords a leaping, 9 ladies dancing, 8 maids a milking, 7 swans a swimming (the swans are swimming in a small pool) 6 geese a laying, 5 golden rings (bags of onion rings), 4 calling birds (in telephone booths), 3 French horns (instead of hens), 2 turtle doves (doves wearing turtle shells), and a partridge (a woman named Partridge) in a pear tree, on top of the person it is used on. The narrator says that the attack can only be used once in a thousand Christmases.