Farscape: Season 4, Episode 3

4 - 3: What Was Lost Part II: Resurrection

When D'Argo and Sikozu come up with a plan to crash Elack (the dying Leviathan) into the Peacekeeper pursuit craft, Crichton is forced to get closer with Grayza to ensure the success of the plan. But when the plan goes wrong Crichton and the rest of the crew are forced to go looking for the third probe to end the magnetic summer forever.