Systems and methods are provided herein for generating summaries of unconsumed portions of an ordered series of media assets, customized for multiple users. A media guidance application may determine that a given media asset of an ordered series is to be collectively consumed by a first user and a second user. A first portion of an ordered series, that both the first user and the second user have not yet consumed, is identified together with a second portion of the ordered series that the first user has consumed but the second user has not yet consumed. A custom summary including a detailed summary of the first portion (e.g., a two minute summary) and less detailed summary of the second portion (e.g., a one minute summary) is generated.