Two girls are found by Jon and Ponch while hitch-hiking. One blames the other for being there and doing this, but Ponch and Jon learn that this is not true. Later they have to save them out of a dangerous situation.

Jon and Ponch must take on the dangerous assignment of escorting a convoy of trucks carrying hazardous chlorine gas.

Sindy has a new study project. She creates Bio Rythms for all officers. Robbie Davis (known from The Volunteers) is in trouble again. Someone attacks her trucks and the drivers lives. Jon and especially Ponch try to help.

Ponch and Jon's 4th anniversary as partners is nearly ruined when a toxic-chemicals dumper (William Lucking, Sons of Anarchy) has a near-catastrophic semi truck crash.