Kakkakuyil movie is about Sivaraman(Mohanlal) who has come to Mumbai for a visa. But Sivaraman finds his friend Govindan Kutty (Mukesh) amidst a sea of problems. Sivaraman is forced to participate in a bank robbery planned by Thomas and his gang, which puts them in more trouble.And they find a place as Kunjunni with the body of Govindan kutty and sound of Sivaraman in the house of a blind old couple (Nedumudi Venu and Kaviyoor Ponnamma), whose grandson Kunjunni who had left them a long time ago (when he was 7) and is now coming home.But a turn of events finds Sivaraman and Govindan kutty (combined) as Kunjunni with the body of Govindan kutty and sound of Sivaraman.
| Actor | Role |
|---|---|
 MohanlalSivaraman | Sivaraman |
 MukeshGovindan Kutty | Govindan Kutty |
 Nedumudi VenuBlind 'Thampuran' | Blind 'Thampuran' |
 InnocentPothuval | Pothuval |
 Arzoo GovitrikarRadhika Menon / Revathy | Radhika Menon / Revathy |
 Kaviyoor PonnammaSethu Lakshmi Bhai / Thampuratty | Sethu Lakshmi Bhai / Thampuratty |
 Jagathy SreekumarAdvocate Nambishan | Advocate Nambishan |
 Cochin HaneefaThomas | Thomas |
 JagadishTyootty | Tyootty |
 Sucheta KhannaAlina | Alina |
 SukumariNambeeshan's wife | Nambeeshan's wife |
 AugustineNot listed | Not listed |
 Shalu MenonNot listed | Not listed |
 SuchitraNot listed | Not listed |
 Manka MaheshNot listed | Not listed |
 Poornima AnandNot listed | Not listed |
 Suniel ShettyKunjunni | Kunjunni |
 Shweta MenonSpecial Appearance | Special Appearance |
 Ramya KrishnanSpecial Appearance | Special Appearance |
 T. P. MadhavanMadhavan | Madhavan |