A battle ensues when Leonard and Sheldon argue over who will get custody of their shared belongings. Also, Raj and Stuart fight to be the most helpful during Bernadette’s final weeks of pregnancy. CHRISTOPHER LLOYD guest stars as Theodore.

The team works with an observer to fix a mistake; Walter befriends someone he admires.

The family attends a birthday party for Hal's father (Christopher Lloyd); the children rally around Lois, who is forced to wear a name tag at the family function.

Fed up with the thankless duty of driving the kids around, Marge starts working as a driver for a transportation app service; Homer bankrupts Moe while watching the bar for a night.

Cassie and Cole head back in time to the 1960s after a groundbreaking clue to breaking the cycle sends them there; Zalmon Shaw returns.

When Jimmy and Sabrina decide to buy a new car that will be safer for Hope, they discover that Jimmy has a rock-bottom credit score that dates back to when he was a child. Burt and Virginia confess that they had maxed out a credit card in Jimmy’s name, and plead with their bank representative Dennis (guest star Lloyd) to clear his debt, even if it means giving up their new DeLorean.