Director Shirish Kunder is busy making a fresh trailer of his upcoming film Joker that would help people get a taste of the heavy-duty VFX that has been used in the film. He has roped in international technicians to assist him in the same. The trailer will feature the much talked about UFO and aliens from the film. The makers have hired around 30 ace international technicians to cut this trailer, which will be aired a week before the film’s release.