Based on the search results, it is not clear which streaming service is currently showing the movie "Halloween." However, the 1978 original movie "Halloween" can be watched on Amazon Prime Video. The 2018 movie "Halloween" can be rented on iTunes, Amazon, Vudu, the Microsoft Store, Google Play, Redbox, and YouTube. The 2021 movie "Halloween Kills" is available to stream for subscribers of HBO Max, and the movie can also be rented on YouTube, AppleTV, Amazon Prime Video, and Vudu. The upcoming movie "Halloween Ends" will be available on Peacock Premium.