Ant-Man 3

Ant-Man 3 was a lot more serious than the previous Ant-Man movies (which were rooted in humour). Actually, it had a big finale vibe, so I personally wouldn't have classified it as the beginning of Phase 5.

Cassie is played by Kathryn Newton, whom I absolutely loved in The Society. <3

There are 2 mid/post-credits scenes and they're actually worth staying for.