The cutscenes may lag in-game for reasons unknown. The cutscenes are video files (.ogg) that can be re-watched with a video player. Codecs may need to be downloaded and I won't be able to help with that.

The files can be found by right-clicking Marauder in the Steam Library, then Properties, Local Files tab, Browse Local Files, VIDEO folder. The .vsub files are subtitle files but my video player could not load them.

The list of files we're interested in are:

• intro.ogg
  
• Marauder_movie_01.ogg
  
• Marauder_movie_02.ogg
  
• Marauder_movie_03.ogg
  
• Marauder_movie_04.ogg
  
• Marauder_movie_05.ogg
  
• Marauder_movie_99.ogg
  
• Marauder_movie_99A.ogg
  
• Marauder_movie_end2.ogg

The first 6 files are explanatory but the last 3 are spoiler-ish and will be covered below in spoiler tags.

Credits to Samz for clarifying the ending requirements.

Marauder_movie_99.ogg - Best ending. Bring companions to the final mission.

Marauder_movie_99A.ogg - Second best ending. Leave our companions behind before the last mission.

Marauder_movie_end2.ogg - Worst ending, kill everyone in the Bazaar.

English subtitles
My video player could not read the .vsub files. As such I have manually converted them to .srt files, you can download them from here: https://drive.google.com/open?id=1qgGpSkLX4S8d3qAmbLza99i1q0hg5F2o

Feel free to translate them to your own language and pass them along to any friends that play.