 Mario is the main character of The Thousand @-@ Year Door , although the game will frequently cut to Princess Peach in the X @-@ Naut Fortress . Much time is spent on her interaction with the computer TEC , which has suffered from a glitch and has fallen in love with Peach to her surprise . The main antagonist of the Mario series , Bowser , tries to collect the Crystal Stars before Mario does instead of directly opposing Mario . Luigi 's role in the game consists of recounting his adventure , which also involves the use of secondary characters in the form of party members . 
