Doom.patrol.s04e02.1080p.web.h264-glhf.mkv.mp4

The group is a known P2P (Peer-to-Peer) release group. While they are prolific, their releases are often scrutinized for the following:

Double extensions are sometimes used to hide malware (e.g., file.mp4.exe ), though in this context, it is likely just a naming glitch. doom.patrol.s04e02.1080p.web.h264-glhf.mkv.mp4

Standard scene releases do not use double extensions. A "proper" release would simply be Doom.Patrol.S04E02.1080p.WEB.H264-GLHF.mkv . ✅ Recommendation If you are the uploader or managing a library: The group is a known P2P (Peer-to-Peer) release group

A file cannot natively be two containers at once. though in this context

They typically release in .mkv . The presence of .mp4 at the end of this specific filename is likely a user-end error or a "repack" by a third party.