Morgan Spence made Disaster Island in his bedroom studio using the popular children's toy, a webcam and his laptop.
Now it has been snapped up by the British Red Cross.
It is the centrepiece of the crisis charity's new campaign focusing on resilience - the ability to cope with disasters both at home and abroad.
Morgan said: "I developed an interest in making animated films about three years ago, but I have been a fan of Lego since I was about four.
"This project was a great chance to combine two of my big interests and do something worthwhile at the same time.
"I have learned a huge amount in the process and I hope Disaster Island will help others understand the importance of resilience.
"The terrible flooding in parts of the UK at the moment shows disasters do not just happen on the other side of the world."
Disaster Island has been made into a game, with Lego figures depicting different scenarios that players can choose from, depending on which character they would like to be.
It also highlights the dangers of communities not being prepared for disasters, which the Red Cross hope will raise awareness about resilience.
Paul Jenkins, Red Cross head of partnership development, said: "Disaster Island highlights the importance of resilience in a simple way.
"It illustrates the need to work with communities to take action beforehand to make sure the impact of disasters is drastically reduced.
"Our work to build resilience with communities has been guiding what we do for decades and is now as important as ever."
Morgan, from Kilbarchan, in Renfrewshire, and a third year pupil at Johnstone High, is working towards his Duke Of Edinburgh bronze award and plans to use the film to help him achieve it.
He said: " Making Disaster Island has taught me a lot about the Red Cross and the work they do at home and abroad.
"If my film helps other people understand that and makes them think, then I will be very proud.
"People are a bit surprised when they find out I make animated films with Lego but all my pals think it is really cool.
"I am excited about my film being shown because it will be seen by a huge number of people.
"I'm hoping to make animation my career so Disaster Island was great experience and will be good to have in my work catalogue."
A spokesman from the Red Cross said the film "really is impressive".
He added: "We are delighted with it."