Where can I watch “The Big Bang Theory” Season 12 Episode 15 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

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Watching earlier episodes in season 12 helps you follow the plot and character arcs leading into this episode.

Watch The Big Bang Theory Season 12 Episode 15 Online

“The Donation Oscillation” — Watch "The Big Bang Theory" Season 12 Episode 15 online in HD for free. Check streaming providers, cast, and episode details.

Feb 7, 2019 Season 12 Episode 15 22 min PG

6.8 ★ ★ ★ ★ ★

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The Big Bang Theory Season 12

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Season 12 Episode 15 — Aired on Feb 7, 2019 • runs about 22 minutes.

Directed by Mark Cendrowski.

Written by Steve Holland, David Goetsch.

Notable cast/guest names in this episode include Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg.

This page includes 3 official still(s) (when available) plus legal availability links.

Looking for “watch The Big Bang Theory Season 12 Episode 15 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Also, Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip.