CD Cardz were introduced in 2000 by Serious Global Ltd of the UK, and consisted of trading card-sized CD-ROMs containing information about a character or sportsperson. They were also sold in the US by Serious USA.
CD Cardz were produced for popular shows such as Buffy the Vampire Slayer, Stargate SG-1, and films such as Final Fantasy, Lord of the Rings and Jurassic Park. The cards contained features such as screensavers, photos, trailers and biographies, and had a picture of the character printed on the disc. There were some sports-related card sets produced for EURO 2000, NBA and NFL, as well as Manchester United and Arsenal Football Clubs.
Like the similar business card CD-ROM, they did not work in slot-loading drives. CD Cardz had a capacity of 80 MB.
The CD Cardz format also appears to have been used to create interactive gift cards.
Serious appears to stopped producing CD Cardz and the later DVD Cardz in 2009 as the website ceased to exist by 2010.