SoapNet will air a 24-hour marathon of the original “Beverly Hills, 90210” on Sept. 1 starting at midnight. Twenty-four episodes from the show’s first four seasons will be featured.

The marathon is in anticipation of the premiere of The CW’s spinoff “90210” on Sept. 2.

A CW spokesman said the network was not connected to the SoapNet promotion and that The CW had not bought any ad time during the marathon to promote its new “90210.”