With his big heart, three eager companions and an old mill teeming with incredible inventions, Calimero sets off on wild adventures to put right all those things in life that are just not fair.

The titular Dad'X (aka Santa Claus), his elves Gadget, Gouly, Love-Love and Cruck (the head elf), his reindeer Swamollo and a fairy named Princess, aid children and animals all over the world. The wicked Striker plots to ruin their plans, ultimately seeking to replace Dad'X and reclaim the Toy Factory he was kicked out of.