Shay Ali

Penny's ex-boyfriend Zack asks Leonard for help after discovering that he's infertile; Koothrappali tries to patch things up with his ex-fiancee, Anu.

After a woman comes to Bunker Hill with a mysterious lung ailment, James ties other respiratory cases in her area to possible contamination from a microchip factory; a man struggles to walk despite his legs being in good condition.

Frankie tries to find something that will make her happy. Meanwhile, Lexie tricks Axl into thinking he is on a lucky streak.

Jen and Greg hire Clementine as a part-time nanny for Lark; Tyler's new girlfriend turns out to be Sophia's fourth-grade teacher; John hires a company to set up an escape room in his house; Matt grows frustrated with Colleen.

JJ is smitten with an injured gymnast; Ray must explain the presence of a risqué picture on his phone; Dylan learns about stress management from Jimmy.

Luis' dad, who works for Javier's wealthy father, arrives in town to test how Javier has handled being cut off financially; Elizabeth agrees to help Jackie on a job and runs into her ex-boyfriend.