Ace actor Pratap Pothen is going to be seen in a very different role in the upcoming film Once Upon a Time there was a Kallan. Sources say that this is going to be an extremely different role. His character named Ousepachan is a 70-year-old person. The film is being directed by Fazil Muhammed. Kalavoor Ravikumar has written the script for it. Ramesh Mehandi who is the permanent make up man of Kamal Haasan is doing the makeup work for Prathap Pothen in this movie.