Where can I watch “The Big Bang Theory” Season 12 Episode 5 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).

Do I need to watch earlier episodes before “The Planetarium Collision”?

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 5 Online

“The Planetarium Collision” — Watch "The Big Bang Theory" Season 12 Episode 5 online in HD for free. Check streaming providers, cast, and episode details.

Oct 18, 2018 Season 12 Episode 5 19 min PG

6.7 ★ ★ ★ ★ ★

40 votes

The Big Bang Theory Season 12

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Where can I watch "The Planetarium Collision" online?

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Season 12 Episode 5 — Aired on Oct 18, 2018 • runs about 19 minutes.

Directed by Mark Cendrowski.

Written by Steve Holland, Tara Hernandez.

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 5 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

When Amy doesn’t have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she’s available to work with him even it if means accidentally sabotaging her career in the process. Raj doesn’t want Howard to join him in hosting a show at the planetarium.