TORONTO - Fans of the TV series "Lost,'' "Grey's Anatomy'' and "Desperate Housewives'' can now catch up with their favourite characters online.

Episodes of the three CTV shows have been posted for viewing at CTV.ca.

CTV says this is the first time the series will be available online on a free, ad-supported basis in Canada.

Each new episode will be posted after its West Coast broadcast and be available for 28 days.

The site will also feature the last two episodes of each series broadcast before their recent hiatus, episode recaps, previews and, in the case of "Lost,'' exclusive online content.

The shows join more than 100 hours of CTV programs already online, including "Nip/Tuck," "The Colbert Report,'' "The Daily Show With Jon Stewart,'' "Corner Gas,'' and "Degrassi: The Next Generation.''

CTV says "Gossip Girl'' returns online with new episodes next month.