Minecraft wiki entry for Spectator, associated text: Spectators can see other spectators and invisible mobs, as well as themselves using F5. Spectators appear as a translucent disembodied head, and any held or equipped items are invisible. Invisible mobs appear translucent, like when viewing an invisible ally with /team modify <team> seeFriendlyInvisibles set to true. (Before 1.13: /scoreboard teams option <team> seeFriendlyInvisibles)