What happened: Kansas City's scheduled game has not started, and the score remains 0-0. Mahomes' arrival puts him in line to appear for the Chiefs after the knee injury that ended his season in December.

Why it matters: His return restores Kansas City's quarterback spot after a long recovery from the injury. It also brings back the player who shapes the Chiefs' offense whenever he is available.

What to watch: Watch for Mahomes' first series once kickoff arrives and how quickly Kansas City's offense settles in. The opening snaps will provide the first live read on his return.