While Uttara, Abhimanyu’s wife, has a limited role in the Sanskrit version of Mahabharata, she plays a significant role in the Bhil version of the epic, where she is known as Antra.
Subhadra is worried that since her son Abhimanyu has decided to participate in the war, he could die without an heir and therefore be condemned to hell. So his virgin wife, Antra, who he had been married off to when she was a young girl and was at her parents awaiting puberty, was summoned. But given the distance and the times, getting Antra to Abhimanyu would take six months. That would be too late and so for a way out of the problem, Krishna’s help was sought.
Krishna agreed to cast a spell over the world, where the night would be prolonged to six months and soon, messengers were sent to fetch Antra. They soon reached the Antra’s kingdom, where they were stopped by the guards who sought more information on their identity, whereabouts and purpose. And then sufficiently armed with all the information, one of the guards was sent off to the palace to alert the king and his family of the developments.