Original: Lilo & Stitch 2: Stitch Has a Glitch (credited as just Lilo & Stitch 2 at the start credits) is a 2005 direct-to-video animated film produced by DisneyToon Studios. The film is regarded as the first "true" sequel to the 2002 Disney feature film Lilo & Stitch and taking place before the events of Stitch!
Simplified: Lilo & Stitch 2: Stitch Has a Glitch is a direct-to-video animated sequel to the 2002 Disney movie Lilo & Stitch and taking place before Stitch!