Saturday's debut averaged 1.2 million total viewers, making it the network's most-watched telecast ever.
The previous record of 1.0 million was set in January by the U.S. premiere of "Doctor Who: The End of Time," a special that marked the swan song of David Tennant as the mysterious time-traveler and introduced Matt Smith as his replacement.
BBC America said "Doctor Who" is also the No. 1 TV series in the iTunes store. The "Doctor Who" reboot features not only a new Doctor but a new companion, played by Karen Gillan.