Better Call Saul has become the highest-rated cable debut in US TV history after it launched this month.

The new show is a spin-off from hit series Breaking Bad, focussing on crooked lawyer Saul Goodman played by Bob Odenkirk.

It joins him early in his career and tracks how his legal dealings took a turn for the criminal, as well as including appearances from familiar faces from the original series.

Better Call Saul
Better Call Saul (AMC)

AMC broadcast the show for the first time on Sunday, and its audience figures of 6.9 million viewers and 3.4 rating among adults 18-49 both make it the best series premiere in cable history, according to the Hollywood Reporter.

The channel’s existing hit drama The Walking Dead also returned for a new series on the same night with 15.6 million viewers, meaning only the Grammys drew in a bigger audience for US TV that week.

Bob Odenkirk Jonathan Banks
Bob Odenkirk and Jonathan Banks star in the spin-off (Andy Kropa/Invision/Press Association Images)

Fictional lawyer Saul first appeared on TV in the series Breaking Bad as crystal-meth-cooking chemistry teacher Walter White’s legal representation.

Jonathan Banks, who played Mike Ehrmantraut in Breaking Bad, is also back for the spin-off series.