October 21, 2017
- Jace Norman as Henry Hart (Kid Danger)
- Cooper Barnes as Ray Manchester (Captain Man)
- Riele Downs as Charlotte Page
- Sean Ryan Fox as Jasper Dunlop
- Ella Anderson as Piper Hart
- Michael D. Cohen as Schwoz Schwartz
- Jeffrey Nicholas Brown as Jake Hart
- Kelly Sullivan as Siren Hart
- Matthew Zhang as Oliver Pook
- Winston Story as Trent Overunder
- Carrie Barrett as Mary Gaperman
- 1. 10/21/17 - Sick & Wired (404)
- 2. 11/04/17 - Brawl in the Hall (405)
- 3. 11/11/17 - The Rock Box Dump (406)
- 4-6. 11/25/17 - Danger Games (401-403)
- 7. 01/15/18 - Toon in For Danger (411)
- 8. 02/10/18 - Meet Cute Crush (418)
- 9. 03/24/18 - Back to the Danger: Part 1 (407)
- 10. 03/31/18 - Back to the Danger: Part 2 (408)
- 11. 04/07/18 - Budget Cuts (410)
- 12. 04/14/18 - Diamonds Are For Heather (417)
- 13. 04/28/18 - Car Trek (412)
- 14. 05/05/18 - Toddler Invasion (416)
Episodes Without Airdates
These episodes have been taped with no known air date. The episodes have been approved to be on here by the founders of the wiki. Note: Episodes may not be in order by date:
- Rubber Duck (409)
- The Thumb Buddies (413)
- Saturday Night Lies (414)
- Henry's Frittle Problem (415)
- Spelling Bee Hard (419)
- Captain Man-kini (420)
- Thumb Buddies Back (421)
- Up The Stairs! (422)
- Season 4 started production on April 3, 2017 and wrapped on December 15, 2017.
- Jace mentioned in an interview with Just Jared Jr that he wants to know a little bit more about Henry’s family.
- Henry Danger and Game Shakers had a crossover 
- This crossover is the second crossover for both series and the second Dan Schneider universe crossover, after iParty with Victorious.
- If you count Game Shippers, this is the third Dan Schneider universe crossover, after iParty with Victorious and Game Shippers.
- It is unknown if Maeve Tomalty (who plays Bianca) will return this season, after previously announcing she would not appear in the third season.
- Jace Norman got a new hairstyle this season.
- When asked to describe this season in one word during an Instagram live stream, Riele said "awesome" and Sean said "cool".
- Starting from Toon in For Danger, Jasper has straight hair.
- The episode Toon in For Danger led into the animated show The Adventures of Kid Danger.
- Starting from Toon in For Danger, the show has new opening credits.
- In an interview with Extra, Jace Norman stated that Henry Danger got renewed for Season 5.
- He also said that Season 5 will most likely be the final season. However Nickelodeon has yet to announce.
- This along with Game Shakers will be Dan's final live action series for Nickelodeon due to Nickelodeon not renewing his contract, plus some controversy with some behind the scenes drama.
- Drex and Vice Mayor Willard returned this season.
- The Toddler, Frankini, and The Ballerino Brothers are expected to return.