Jellyfish Invaders

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Adds animated flying retro space invaders to your blog. You can configure,
number, size, behaviour and where they appear.

Author:Robert Miller (profile at
WordPress version required:3.0
WordPress version tested:4.0
Plugin version:0.9
Added to WordPress repository:06-01-2013
Last updated:11-10-2014
Warning! This plugin has not been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Rating, %:0
Rated by:0
Plugin URI:
Total downloads:1 655
Active installs:60+
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Your new pixelated pals will randomly fly around, and if you choose, home in on any mouse clicks. The glowing retro 8bit scan-line effect space invaders work on most backgrounds but obviously are more suited to a dark theme. It's easy to configure the number, size, behaviour and where the invaders appear through the comprehensive admin control panel.

Demo and more information at the plugin homepage:

Configuring your Invaders

A new settings page will be added to your Admin Appearance section, where you can change the look and behaviour of your new binary buddies. Here's an overview of the available settings:

  • Enable Invaders Turn the invaders off and on. A quick way to temporarily disable the invaders without deactivating the plugin.

  • Where to show you can choose either everywhere OR only on individual posts or pages. You can use this second option to just show them on your home page or a single post for example.

  • **The invaders will look out for a custom field called "jellyfish_invaders" on any post or page. If they find one and it has a value of 'true' or 'on' they will populate the page.

  • Number of Invaders how many individual space invaders you want, keep this number quite low to avoid slowing down your page too much

  • Invader Size size of the invaders

  • Fly Time how long the invaders fly around before pausing in milliseconds (1000 = 1 second)

  • Pause Time How long the invaders Pause (or wiggle see below) for between flying cycles.

  • Random adds some variation to the time settings so each invader acts a little differently.

  • Wiggle Instead of pausing the invaders will do a missile evasive wiggle.

  • Attack Mode None, One or All of the invaders will home in on any mouse clicks.

By default the invaders will be free to roam randomly around the entire page, but there are a couple of methods to confine them to specific areas if you wish.

  • Containing Element the invaders will only roam within the element set here, normally that's body (the whole page) but you may enter the id of an element on the page to confine them to a specific area. You can see this in effect right here where the invaders have been limited to the section at the top of the page.

  • Z-Index If you'd like the invaders to hide behind certain layers on your page you can set an appropriate z-index here, obviously this setting it very dependant on the structure of your WordPress theme.

  • Use Electric Fence Check this option and use the top, left, right and bottom options to define a virtual fence that will contain the invaders. The values you enter represent pixels position on the entire document. Note, this option will override any custom setting for Containing Element.