MLB Network is rolling out an unusual interstitial branding campaign, titled “All In One Place.”

The ad features a slew of all-time great MLB players, from Jackie Robinson to Babe Ruth, Ted Williams to Sandy Koufax, and even modern players like Alex Rodriguez and Ken Griffey Jr–in their old team uniforms.

The players appear on MLB Net’s Studio 42, the baseball diamond the network constructed in its New jersey headquarters, with Bob Costas narrating:

For now, the ad is only running on MLB Network and online, though given how unusual it is, don’t be surprised if it pops elsewhere in the future.