[1] Each episode follows the Great Eek summoning three children from Peopleworld (the Tronji name for Earth) and enlisting their help in reaching the saddest part of the broken pieces of Tronji and repairing the damage done using their special skills, whilst the Great Eek and Tronji-O locate Tronji-I in Peopleworld, who usually materializes within an unhappy situation, in which the Great Eek and Tronji-O use gem power from the children to fix the situation and therefore use Double Happiness to return the broken pieces back together.

He is a pale-skinned being dressed in purple, including a large top hat with a jewel on the front and carries a cane which doubles as a wand, which he uses to reconnect the broken pieces of Tronjiworld.

Whenever trouble strikes in Tronjiworld and there are significant levels of sadness, he will summon three skilled children from Peopleworld to help him in fixing the problem.

Tronji-O is a female Tronji who has a red, bean-shaped body, a golden disc on her stomach and three short hairs on her head.

When the Great Eek uses his powers to bring the broken pieces of Tronjiworld back together, Ooee-Ooee turns golden, a result of 'Double Happiness'.