Director: Vikram K. Kumar
Cast: Suriya as Sethuraman, Athreya, and Mani (in a triple role), Samantha Ruth Prabhu as Sathyabhama aka Sathya, Nithya Menen as Priya, Saranya Ponnavan as Sathyabhama, and Ajay as Mithra.
Dr. Sethuraman is a reputed scientist and watchmaker who lives with his wife Priya and newborn son Mani in a mansion with a laboratory at Megamalai. In January 1990, on his birthday he invents a watch using which a person can travel back and forth in time for a maximum of 24 hours. His evil twin brother Athreya(Suriya) tries to take the watch and kills Priya in the process. Sethuraman escapes with Mani and boards a train.
Before Athreya arrives, he hands Mani to a passenger named Sathyabama (Saranya Ponvannan) and pleads with her to save his son. Athreya kills Sethuraman and is seriously injured in an attempt to escape. Sathyabama's father is against her decision to save Mani, and she leaves with him for Chennai to honor the promise given to Sethuraman.
26 years later, Mani becomes a watchmaker who considers Sathyabama as his biological mother. A paralyzed Athreya wakes up from the coma and decides to find the watch. He hopes to go back to 1990 and save himself from the accident. In a series of incidents, Mani finds Dr. Sethuraman's watch and explores its powers.
Using them, he manages to impress Sathya, his client who hails from Sathyabama's native place Gopalasamudram. Athreya’s close aide Mithran issues an advertisement offering five crores to the one who finds Dr. Sethuraman's watch. Including Mani, many prepare the duplicate of the watch and submit them. But Athreya spots Mani's design accurate and kills him, thereby gaining possession of the watch.
Athreya is shocked to know that the watch can only help him travel back and forth only for 24 hours and decides to revive Mani. What happens after that and will Mani understand that Athreya killed his father Sethuraman and avenge his parents' deaths form the crux of the story.
24 received generally positive critical response. Considering all languages, the movie failed to recoup the theatricals. But it was declared a hit in Telugu. Suriya's performance, innovative storytelling, and Vikram Kumar's direction are praised.