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Top 5 Subplot Mistakes Writers Make

All About Subplots

Subplots are key to making a killer script. But misusing them can also be its downfall. So, what is a subplot?

A subplot is a secondary storyline which runs parallel to the main story. They are the secret to making a truly compelling screenplay and can be the lifeblood of your act two.

Great subplots allow you to bring meat to your script, flush out your storyline, and reveal new aspects of your central and supporting character’s personality.

All too often subplots are under-utilised or go way off the rails. Let’s look at a few hazards to avoid when using a subplot.

1) Your subplot is under-developed 

This is a biggie. Unfortunately, subplots can be used as the “side adventure” for a supporting character. Hijinks abound during this subplot with big action scenes and the occasional comedy relief. This can be lots of fun but not if our supporting character doesn’t actually grow and change throughout this subplot.

If the sole reason is just to create a “spectacle,” then your subplot has failed. Remember, a supporting character is on their own little hero’s journey as well.

If your supporting characters do not meet a challenge and their mettle is not adequately tested, then this subplot has failed. The supporting character should emerge from this subplot changed, both internally and externally.

Top Tips:

  • A subplot plot must reveal new and interesting aspects of the character’s personality.
  • Subplots are the supporting characters own “mini hero’s journey.”
  • Avoid using subplots merely for big action moments, comedic beats, glory kills, or dazzling special effects.
  • The supporting character needs to have a complete arc in their subplot.
  • Make sure the subplot forces your supporting character to evolve past their internal and external conflicts.

MORE: 15 Reasons Your Story Sucks 

2) Your subplot doesn’t ‘fit’ the story 

The issue here is about theme. When writing a script, the theme is the meaning of your story. It’s what you are trying to say through the screenplay.

A proper subplot should either support this theme or be the antithesis of it. By supporting the theme, it shows what our central character is trying to achieve and what they are fighting for.

However, as the antithesis, your subplot can also show the dreaded results that lie in wait for our central character should they fail during their journey.

If you have a subplot that doesn’t do either of these, then throw it out. It will leave your script feeling muddied and confused.

Top Tips:

  • A subplot should reflect or support the theme of your script.
  • Alternatively, a subplot can be the antithesis of your theme as a cautionary tale.
  • If a subplot doesn’t have meaning to your script, then cut it.
  • An unfocused subplot will muddy your script.
  • Meandering subplots will slow the pace of your script to a crawl.

3) Too many subplots!

The main plot will only get you so many pages in a script. Usually, around 45-60 pages and then your story will run out of steam. That’s when you start whipping in subplots to fill out your script.

The only problem is if you work in too many subplots then none of them have time to be developed appropriately. This can often be seen in ensemble films where they try and develop an all-star cast of characters. It will be done through long bouts of exposition or even quick flashbacks but ultimately leave you feeling like you’ve stuffed yourself on cotton candy. Sweet but ultimately hollow.

Top Tips:

  • A main plot will only get you so far. Proper subplots can fill out your page count.
  • An abundance of subplots means none of them have time to be properly developed.
  • Too many subplots result in characters feeling shallow.
  • When in doubt stick with a heart plot, supporting character subplot, and antagonist subplot only.

4) Subplots that compete with the main plot

Sometimes you will fall in love with a supporting character or a really cool Antagonist. They may have fantastic personality traits that will make them unique and exciting. (This often happens if they are the snarky comedic-type, or a villain that is fun to write).

The problem is too much time with these characters will overshadow your central character’s journey. That can lead to an identity crisis in the script as the reader will not know who to focus on.

The defense I’ve heard for this is that there are “two main characters” or co-stars. It doesn’t work and just leaves the script/film feeling confused.

Pick one central character when developing your script. Either scale back the fun sidekick and villain or consider revamping the script to center around the character in which you really want to write instead.

Top Tips:

  • Antagonists can be lots of fun to write, but if we’re not careful it can lead to a subplot which overshadows the central character’s plot.
  • A supporting character’s subplot can be overdeveloped and compete with the central characters. This leaves the reader confused about whose story it is.
  • If you really love writing a particular character, chances are their subplot is competing with the central characters.
  • Don’t be afraid to scale back or combine subplots if needed.
  • If you are struggling with a bloated subplot of a supporting character, then perhaps they need to be the central character instead.

5) Your subplot plain sucks!!

Sometimes it’s just time to admit that a subplot sucks. Usually, when this happens, it’s because the supporting character is too similar to the central character. Instead, try infusing them with traits that are the exact opposite of your central character and make sure to give them a unique voice as well.

The last thing you want is for your characters to sound the same. Then rewrite the scenes accordingly with your characters new approach.

Top Tips:

  • Take the ego out of it. Sometimes subplots just don’t work.
  • Don’t be afraid of the rewrite.
  • If the supporting character is too similar to the central character, then the subplot will feel boring and redundant.
  • Make sure your characters all have a unique voice and don’t sound the same.
  • Give your supporting character traits which are opposite of your central characters. Then rework the subplot with this new approach.

BIO: Geoffrey D. Calhoun is the author of the bestselling book, The Guide For Every Screenwriter – From Synopsis To Subplots: The Secrets of Screenwriting Revealed and is the founder of

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