4. Deadpool and Wolverine
You talk about a movie decades in the making. Deadpool and Wolverine is a real anomaly here because it single-handedly managed to make the whole X-Men universe canon to the MCU (albeit in a parallel dimension) in just one movie, using the MCU's pre-established Multiverse Saga lore to pull it off. And they did pull it off - significantly so.
The third movie in the Deadpool franchise, Ryan Reynolds' Merc With A Mouth made his official debut in the Marvel Cinematic Universe here, but he also brought with him the most iconic character from the X-Men franchise to do it: Hugh Jackman's Wolverine. The melee and chaos that resulted from this team-up was nothing short of spectacular.
Deadpool and Wolverine is a nostalgic trip down memory lane, revisiting some of the greatest aspects of the X-Men movie series, that also sets up the future of the MCU. That marriage of these two iconic, established worlds is so seamless that it feels like fans of either franchise could just watch this movie and understand both of them.
A truly insane movie that leans on genuinely witty humor and still manages to pack an emotional punch, Deadpool and Wolverine is Phase Five's biggest success story (a $1.3 billion kind of success) while also being one of its most competent outings at the same time.
LFG!