The Big Bang Theory

The Collaboration Fluctuation

Series 10 - Episode 19 The Collaboration Fluctuation



Friends in unfamiliar situations is the theme of tonight’s boffcom bulletin. Leonard feels put out when his new lodger Raj monopolises Penny with facials and related activities, so he hangs out with new parents Howard and Bernie.

Sheldon, meanwhile, realises a project that his neurobiologist fiancée Amy has been working on has implications in his own field, and embarks on a collaborative enterprise. While setting out some ground rules, they discover that being critical of each other actually helps their thought processes. Surely that will make Sheldon insufferable? Sorry, more insufferable..?


Leonard, Penny and Raj settle into their new living arrangement, but Penny and Raj get along so well together that Leonard starts to feel left out. Sheldon expresses an interest in Amy's work and they begin to collaborate on a scientific project.

Cast & Crew

Leonard Hofstadter Johnny Galecki
Sheldon Cooper Jim Parsons
Penny Kaley Cuoco
Howard Wolowitz Simon Helberg
Raj Koothrappali Kunal Nayyar
Amy Farrah Fowler Mayim Bialik
Bernadette Rostenkowski Melissa Rauch
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