The upcoming Marvel Cinematic Universe (MCU) film, Thunderbolts, marks a significant milestone as the final installment of Phase Five. This cinematic event brings together an ensemble cast with deep roots in the MCU's expansive narrative tapestry. Spanning 17 years of storytelling, it may seem daunting to catch up on all the necessary backstory. However, this guide simplifies the process by identifying key films and series that provide essential context without overwhelming newcomers or long-time fans.

Among the characters set to appear in Thunderbolts is Bucky Barnes, also known as the Winter Soldier. His journey begins in "Captain America: The First Avenger" where he is introduced as Steve Rogers' loyal companion. Over time, his storyline evolves through various films such as "Captain America: The Winter Soldier," "Civil War," and appearances in both "Black Panther" and the Avengers duology. Additionally, his partnership with Sam Wilson is explored in depth within the Disney+ series "The Falcon and the Winter Soldier."

Another pivotal character joining the roster is John Walker, who transitions from being the government-appointed successor to Captain America into assuming the mantle of U.S. Agent. Introduced during "The Falcon and the Winter Soldier," Walker's arc explores themes of identity and responsibility under pressure.

Yelena Belova adds complexity to the team dynamics. Originating from "Black Widow," her story intertwines betrayal and familial bonds while showcasing her exceptional combat abilities. Meanwhile, Taskmaster emerges as a formidable adversary capable of mimicking any fighter’s style, making their role unpredictable yet crucial.

Newcomers like Bob, alias Sentry/Void, bring fresh energy alongside returning faces such as Alexei Shostakov, better known as Red Guardian, whose charm balances out more intense moments. Rounding out the core group are Ava Starr, referred to as Ghost, bringing technological prowess derived from "Ant-Man and the Wasp," and Valentina Allegra de Fontaine, orchestrating events behind the scenes across multiple projects including "Black Widow" and "Black Panther: Wakanda Forever."

Ultimately, while familiarity enhances enjoyment, Thunderbolts stands alone as its own narrative experience. Each member contributes unique perspectives shaped by their respective journeys throughout the MCU thus far, ensuring an engaging spectacle whether viewed independently or immersed fully within its universe.