It is winter in a prestigious all boys' boarding school, where children continue to practice age-old rituals and codes bound by years of hierarchy of the popular norm. Shay is picked at constantly, the main perpetrators being Arjun, the tall athletic sports captain and his best friend Baadal. Shay and Prithi, the spunky daughter of the new Junior School Principal are cast as Bassanio and Portia in the Founders Day production of Merchant of Venice. Murali, the charismatic drama teacher unknowingly adds salt to Baadal's wounds by casting him as Shay's understudy. Indignant, Baadal vows to get Shay's part at any cost and turns to his buddy Arjun for help. Events take a sinister turn when Shay walks in on Arjun, Baadal and their cronies on a debauched night.
Big Baby tells the story of Adam Lewis, a successful horror screenwriter struggling for inspiration for his latest script. After a graphic and realistic nightmare of a hulking man dressed in a baby mask and onesie who axe murders his girlfriend Kate in the middle of the night, Adam gets the inspiration he needs for his new screenplay. Excited about the direction his story is taking, he starts losing himself in his script. Things are better than ever for Adam and Kate until “Big Baby” starts appearing in real life and tormenting and killing victims fueled by his own revenge. Characters from Adam’s script begin to pay him visits pleading for their lives, and he quickly realizes he holds their fate in his hands. Power and fear completely consume Adam until his girlfriend Kate is terrified of the man she once loved.