What happened: The joint promotion with Marvel ties the five MLB stars to the theatrical release of Avengers: Doomsday, scheduled for Dec. 18. The behind-the-scenes feature expands on the MLB and Marvel Avengers: Doomsday baseball crossover introduced during the Fall Classic.

Why it matters: Pairing veteran stars Bryce Harper, Freddie Freeman and Randy Arozarena alongside Jacob Misiorowski and Junior Caminero places five marquee players across different career stages in the spotlight of baseball's championship series.

What to watch: Avengers: Doomsday opens in theaters on Dec. 18 while MLB's World Series broadcast continues.