Saif Ali Khan production venture 'Go Goa Gone' entertained the audience to the fullest in the year 2013.

Apparently the makers of the movie are now planning for a sequel of this zombie flick. However this time it'll be aliens instead of scary looking zombies.

A source says,"Yes, the team is working on the script of 'Go Goa Gone' sequel and it will certainly get bad (gory) this time."

"If things go well after experimenting with zombies, the sequel is said to have aliens in it. It will be a film that was never seen before on the celluloid," the source added.

Saif is working with Raj Nidimoru and Krishna DK for the second time post 'Go Goa Gone', as his upcoming film 'Happy Ending' is also directed by this duo.