Monday

Richard buys a ’78 Cutlass so Aaron can build Gas Monkey’s first ever lowrider, he only to discover that Aaron’s plan to create custom hydraulics is something he’s never attempted before.

Ashley faces danger head-on when a riled-up customer refuses to leave the store. Then, the friction may have cooled between Rich and Ashley, but when he screws up a major job for Les, Seth takes the heat. Unwilling to fail in his father's eyes, Seth takes Rich on in a face-to-face confrontation with neither man willing to back down.

Les hatches a plan to celebrate the store's 30th Anniversary. But when he drops the bomb on Seth and Ashley that they have to plan the biggest event in the business' history, everything starts to unravel. What was intended to bring the siblings together backfires, driving them even further apart. Then, in the midst of pure chaos, Les goes overboard when a customer tries selling him fake gold.

As the deadline approaches, Seth and Ashley scramble to pull their individual events together. Amidst a crushing wall of pressure from Les, customers that have fully lost their minds and fierce sibling rivalry, the chaos mounts to a breaking point. But when the dust settles and the cash is counted, Les delivers devastating news that rocks his family and staff to the core.

With Les' threat of opening another store looming in the air, Seth and Ashley must band together to convince him otherwise. Then, a customer looks for fast cash by trying to sell his prosthetic eye. And later, when Les suddenly reveals he's found the location for the new store, Seth and Ashley go through the roof. But just when things seem to have settled down, Les does something that will change the family dynamic forever.

Ron decides to bring his ex-con cousin, Johnny, onto the Lizard Lick team.

Johnny puts the moves on Amy.