Five Servos of Doom

Sentinel Prime has incredible success capturing fugitive Decepticons Sunstorm, Blitzwing, Swindle (who is still frozen in vehicle form), and Lugnut. This leads Prowl to suspect he's getting help. As he flashes back to his training under Yoketron, Prowl discovers that Lockdown is helping Sentinel for a price. Prowl ultimately defeats Lockdown, avenging Yoketron's death and regaining Yoketron's helmet as well as his upgrade armor in the process, but the bounty hunter escapes. Prowl is seen in all following episodes wearing his armor and Yoketron's helmet.