There are a number of different cinemas in Medway such as the Odeon in Chatham. This is a popular one due to the fact that you get free parking, is pretty easy to get to and there are various other things that you can do near the cinema such as shopping at the Dockside centre and eat at the various restaurants.
There is also the Cineworld at the Medway Valley Leisure Park which has been under the ownership of various companies over the years but has a decent reputation. There are also films shown at The Central Theatre, which is on Chatham High Street, as part of The Other Cinema which shows a range of different types of old and new films.