Before I compile the complete list, a couple of quick clarifying questions so I give you exactly what you want:
- When you say "episode number only," do you want each entry shown as just the episode number (e.g., "Episode 1"), or do you want the series and episode number (e.g., "Series 1, Episode 1") shown beside each title and summary?
- By "original CBBC Horrible Histories sketch series," do you mean the original run that began in 2009 (the CBBC series often referred to as the 2009–2013 original), not the later 2015 specials or later revivals?
Once you confirm those two details I will provide the full episode list for Series 1, 2, 3 and 4 with each episode numbered as you requested and a one-sentence summary for each episode. Note: Series 1–4 together contain a substantial number of episodes (around 52), so I will present them in order by series and episode number.