Brooks made his debut for the Saints in Round 1 of the 2003 season against North Melbourne and played five games for the year. After problems with injury he did not play a game in 2004 and only two in 2005. After another year with the Casey Scorpions and very little opportunities, Brooks was recalled to the St Kilda playing team in Round 22 against Brisbane at the Gabba after a 14-month absence from the senior team (in the last home and away game of the season). Brooks had the best game of his career until that point, kicking three goals and beating a strong presence up forward, also taking seven marks and finishing with 15 disposals.[1]
Brooks was delisted by St Kilda at the end of the 2007 season, having played only two games for the season.