Three's a Crowd Transformers: Animated : Season 3 Episode 4

Bulkhead and Isaac Sumdac try to rebuild the Space Bridge that Megatron had built. When Bulkhead convinces the Constructicons to help out, a combination of a forklift, a Headmaster unit and an Allspark fragment gives birth to Dirt Boss. Meanwhile, the others track down any remaining Decepticons and run into Lugnut.