This week it's mast ki paathshaala on Nach Baliye 4 where the couples are set to pack their school bags for they are taking a trip down memory lane. It's the "Bachpan special" episode. Dressed as kids, the contestants will take to the floor and through the medium of dance and drama highlight issues as well. Judging them will be their "strict teachers" - Karishma, Farah and Arjun who will dole out the report cards too. Keeping an eye on the class and the students will be Aishwarya and Ali who step in as the monitors. The "examination" will begin with the performance of Sudeep and Anantika. The couple will raise their concern against bonded labour through their performance, one that gets them a pat on the back from the teachers. Up next will be the "new" students in Nach Baliye 4, Chetan and Lavinia. The couple will narrate the famous tale of Alladin. Showcasing the innocence and the imaginative power of children are the lovely duo - Kapil and Anjali - who will perform on a song from 'Salaam Namaste'. The performance sees Karishma reward them with lollipops! There's more fun promised with Abhijeet and Shilpa enacting Bal Krishna and focussing on the victory of good over evil. Catch all the action this Friday at 8 pm on Star Plus.