This is a story taken from the "Vanaparvam" of Mahabharatha. It is written by the great Attakkatha composer, Kottayam Tampuran.
Immediately after Pandavas were sent to Forest by Duryodhana (so the sory starts in the middle of Duryodhanavadham), Dharmaputhra and Panchali were thinking of how to feed the Brahmins who followed them to the jungle. So they decided to see "Showmya Muni" (not sure the exact name). The sage sugested them to pray Lord Surya (Lord Sun). Upon their pray, Lord Surya is coming in front of them and presented them "Akshaya parthra" with the condition that this special vessel will be full of food until Panchali is taking food. One day, Sree Krishna came there and seeing the difficulties faced by Pandavas, He became angry and thought "Sree Chakram" to kill all Kouravas. "Sudarshana Chakram " will appear in front of Him. But then Dharmaputhra will stop Sree Krishna from doing this action.
Duryodhana came to know about the "Akshayapathra labham" of Pandavas. So he decied to send Sage Durvasav and his 10000 diciples to the place of Pandavas just when Panchali finishes her lunch. So dharmaputhra will request them to take bath and come back for the lunch. Then Panchali will pray to Lord Krishna and Lord will immediately appear in front of her tlling that He is very hungry and he will get a single rice from the "Akshayapathra" and Lord will eat that rice. Immediately sage and his disciples will feel that their stcmach is full while they are taking bath. So they will bless Pandavas from near the river itself and will go back from there.
One day, the sister of Kirmeera (Simhika) will come near Panchali in the form of a beautiful woman when Pandavas are not present there and will start talking each other. Slowly she will take Panchali to the inner forest. After some time, Panchali will tell that she wants to go back. Then the Lalitha will take her real form and will tell that she will eat Panchali then. Hearing the crying of Panchali Sahadevan will come with a sword and will break Simhika's ear,nose, breast etc. She will run away from there towards and Kirmeera will become angry uopn knowing this incident. He will fight with Sahadeva and will caught him. Then our Bheema will come there and he will kill Kirmeera in a fight.
Ususally in most stages the scene "Lalitha and Panchali" is used to play nowadays. This is a story where "Ninam" is also present. ("Ninam" will be coming near Kirmeeran). Also the crown for Lord Surya will contain some additions to indicate the rays coming out of Him. Sudarshana Chakram has special make-up on the face to reflect the charector. Also there will be "Panthams" on both hands of Sudarshana Chakram.