S04E20How I Met Your Mother · Season 4
How I Met Your Mother season 4 episode 20: Mosbius Designs
Aired 13 April 200922 minRated TV-14
Where to watch How I Met Your Mother Season 4 in Australia
How I Met Your Mother season 4 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $24.99 and Prime Video Store from $24.99.
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Availability checked 16 November 2026.
What happens in “Mosbius Designs”
Ted goes out on his own as an architect and hires an intern to help get things started, but the intern gets a little too close to others in the gang.
Episode summary: TMDB.
Before you watch
- It is episode 20 of 24 of season 4, so watch episodes 1 to 19 first.
- It runs about 22 minutes.
- Directed by Pamela Fryman, written by Kourtney Kang.
- TMDB users rate it 7.4 out of 10 (36 votes).
How I Met Your Mother trailer
The official trailer for the series (no preview of this episode has been published).
Play video: How I Met Your Mother trailer
Cast and crew of this episode
- Director
- Pamela Fryman
- Writer
- Kourtney Kang
- Guest stars
- Ryan Sypek as PJStephen Holland as Creepy Back Rub GuyJoel Spence as Toy GuyBo Barrett as Guy 2Edward Rudolph Flores as Food GuyDarren O'Hare as Guy 1
Credits: TMDB.
More from How I Met Your Mother Season 4
Every episode of Season 4How I Met Your Mother episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.