Episode 312, "Follow The Leader"
SEASON 3, EPISODE 319 - When gunmen hold Team One at bay from a bus crash, Spike learns his Mentor Oliver may be connected. In a game of cat and mouse, SRU tracks a team of criminals who are working with Oliver. Parker and the team believe that this rogue cop is part of the bus crash caper, but Spike insists that he must be involved for other reasons. The team gets called in to assist at the crash site when shooting breaks out. They investigate, and track the bus driver back to a drug ring. Spike's old mentor turns out to be protecting his family.