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The actors i know and have memories with or the actors that i like can boost my interest on a movie to give it a chance.
Right now i can provide you an example. I am about to start watching two TV shows and one of the biggest attractions comes with the involvements of the actors that i am familiar with.
Colony - Sarah Wayne Callies (which mainly i've known her by Prison Break, plenty of movies and The Walking Dead) and Josh Holloway (From Lost and one other movie)
Legends Of Tomorrow (I am giving it a try only because of Wentworth Miller and Dominic Purcell)