Any movie that didn't get the sequel it deserved. Doesn't count if the movie has a planned sequel that just hasn't come out yet, or if the movie is super recent and could have a sequel in the next year or two.
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The Mask.(Som of The Mask is not a sequel. It’s a flaming garbage dump. It’s not a real Mask sequel without Jim Carrey!)
I really wanted Rock N Rolla (Guy Ritchie movie) to have a sequel. There was another but memory fails me right now.
Amazing Spider-Man 2
Tomorrow when the war began. It was originally meant to be a trilogy but the other two were never made.