diff --git a/spec/theme-manager-spec.coffee b/spec/theme-manager-spec.coffee
index ea0ca19..bb027f3 100644
--- a/spec/theme-manager-spec.coffee
+++ b/spec/theme-manager-spec.coffee
@@ -40,7 +40,7 @@ describe "atom.themes", ->
   describe "when the core.themes config value contains invalid entry", ->
     it "ignores theme", ->
       atom.config.set 'core.themes', [
-        'atom-light-ui'
+        'fusion-ui'
         null
         undefined
         ''
@@ -48,21 +48,19 @@ describe "atom.themes", ->
         4
         {}
         []
-        'atom-dark-ui'
       ]

-      expect(atom.themes.getEnabledThemeNames()).toEqual ['atom-dark-ui', 'atom-light-ui']
+      expect(atom.themes.getEnabledThemeNames()).toEqual ['fusion-ui']

   describe "::getImportPaths()", ->
     it "returns the theme directories before the themes are loaded", ->
-      atom.config.set('core.themes', ['theme-with-index-less', 'atom-dark-ui', 'atom-light-ui'])
+      atom.config.set('core.themes', ['theme-with-index-less', 'fusion-ui'])

       paths = atom.themes.getImportPaths()

       # syntax theme is not a dir at this time, so only two.
-      expect(paths.length).toBe 2
-      expect(paths[0]).toContain 'atom-light-ui'
-      expect(paths[1]).toContain 'atom-dark-ui'
+      expect(paths.length).toBe 1
+      expect(paths[0]).toContain 'fusion-ui'

     it "ignores themes that cannot be resolved to a directory", ->
       atom.config.set('core.themes', ['definitely-not-a-theme'])
@@ -86,7 +84,7 @@ describe "atom.themes", ->
       runs ->
         didChangeActiveThemesHandler.reset()
         expect(document.querySelectorAll('style.theme')).toHaveLength 0
-        atom.config.set('core.themes', ['atom-dark-ui'])
+        atom.config.set('core.themes', ['fusion-ui'])

       waitsFor 'b', ->
         didChangeActiveThemesHandler.callCount is 1
@@ -94,17 +92,16 @@ describe "atom.themes", ->
       runs ->
         didChangeActiveThemesHandler.reset()
         expect(document.querySelectorAll('style[priority="1"]')).toHaveLength 2
-        expect(document.querySelector('style[priority="1"]').getAttribute('source-path')).toMatch /atom-dark-ui/
-        atom.config.set('core.themes', ['atom-light-ui', 'atom-dark-ui'])
+        expect(document.querySelector('style[priority="1"]').getAttribute('source-path')).toMatch /fusion-ui/
+        atom.config.set('core.themes', ['fusion-ui'])

       waitsFor 'c', ->
         didChangeActiveThemesHandler.callCount is 1

       runs ->
         didChangeActiveThemesHandler.reset()
-        expect(document.querySelectorAll('style[priority="1"]')).toHaveLength 2
-        expect(document.querySelectorAll('style[priority="1"]')[0].getAttribute('source-path')).toMatch /atom-dark-ui/
-        expect(document.querySelectorAll('style[priority="1"]')[1].getAttribute('source-path')).toMatch /atom-light-ui/
+        expect(document.querySelectorAll('style[priority="1"]')).toHaveLength 1
+        expect(document.querySelectorAll('style[priority="1"]')[0].getAttribute('source-path')).toMatch /fusion-ui/
         atom.config.set('core.themes', [])

       waitsFor ->
@@ -113,8 +110,8 @@ describe "atom.themes", ->
       runs ->
         didChangeActiveThemesHandler.reset()
         expect(document.querySelectorAll('style[priority="1"]')).toHaveLength 2
-        # atom-dark-ui has an directory path, the syntax one doesn't
-        atom.config.set('core.themes', ['theme-with-index-less', 'atom-dark-ui'])
+        # fusion-ui has an directory path, the syntax one doesn't
+        atom.config.set('core.themes', ['theme-with-index-less', 'fusion-ui'])

       waitsFor ->
         didChangeActiveThemesHandler.callCount is 1
@@ -123,10 +120,10 @@ describe "atom.themes", ->
         expect(document.querySelectorAll('style[priority="1"]')).toHaveLength 2
         importPaths = atom.themes.getImportPaths()
         expect(importPaths.length).toBe 1
-        expect(importPaths[0]).toContain 'atom-dark-ui'
+        expect(importPaths[0]).toContain 'fusion-ui'

     it 'adds theme-* classes to the workspace for each active theme', ->
-      atom.config.set('core.themes', ['atom-dark-ui', 'atom-dark-syntax'])
+      atom.config.set('core.themes', ['fusion-ui', 'dark-bint-syntax'])
       workspaceElement = atom.views.getView(atom.workspace)
       atom.themes.onDidChangeActiveThemes didChangeActiveThemesHandler = jasmine.createSpy()

@@ -134,7 +131,7 @@ describe "atom.themes", ->
         atom.themes.activateThemes()

       runs ->
-        expect(workspaceElement).toHaveClass 'theme-atom-dark-ui'
+        expect(workspaceElement).toHaveClass 'theme-fusion-ui'

         atom.themes.onDidChangeActiveThemes didChangeActiveThemesHandler = jasmine.createSpy()
         atom.config.set('core.themes', ['theme-with-ui-variables', 'theme-with-syntax-variables'])
@@ -146,8 +143,8 @@ describe "atom.themes", ->
         # `theme-` twice as it prefixes the name with `theme-`
         expect(workspaceElement).toHaveClass 'theme-theme-with-ui-variables'
         expect(workspaceElement).toHaveClass 'theme-theme-with-syntax-variables'
-        expect(workspaceElement).not.toHaveClass 'theme-atom-dark-ui'
-        expect(workspaceElement).not.toHaveClass 'theme-atom-dark-syntax'
+        expect(workspaceElement).not.toHaveClass 'theme-fusion-ui'
+        expect(workspaceElement).not.toHaveClass 'theme-dark-bint-syntax'

   describe "when a theme fails to load", ->
     it "logs a warning", ->
@@ -381,13 +378,13 @@ describe "atom.themes", ->
       activeThemeNames = atom.themes.getActiveThemeNames()
       expect(console.warn.callCount).toBe 2
       expect(activeThemeNames.length).toBe(2)
-      expect(activeThemeNames).toContain('atom-dark-ui')
-      expect(activeThemeNames).toContain('atom-dark-syntax')
+      expect(activeThemeNames).toContain('fusion-ui')
+      expect(activeThemeNames).toContain('dark-bint-syntax')

   describe "when in safe mode", ->
     describe 'when the enabled UI and syntax themes are bundled with Atom', ->
       beforeEach ->
-        atom.config.set('core.themes', ['atom-light-ui', 'atom-dark-syntax'])
+        atom.config.set('core.themes', ['fusion-ui', 'dark-bint-syntax'])

         waitsForPromise ->
           atom.themes.activateThemes()
@@ -395,8 +392,8 @@ describe "atom.themes", ->
       it 'uses the enabled themes', ->
         activeThemeNames = atom.themes.getActiveThemeNames()
         expect(activeThemeNames.length).toBe(2)
-        expect(activeThemeNames).toContain('atom-light-ui')
-        expect(activeThemeNames).toContain('atom-dark-syntax')
+        expect(activeThemeNames).toContain('fusion-ui')
+        expect(activeThemeNames).toContain('dark-bint-syntax')

     describe 'when the enabled UI and syntax themes are not bundled with Atom', ->
       beforeEach ->
@@ -408,8 +405,8 @@ describe "atom.themes", ->
       it 'uses the default dark UI and syntax themes', ->
         activeThemeNames = atom.themes.getActiveThemeNames()
         expect(activeThemeNames.length).toBe(2)
-        expect(activeThemeNames).toContain('atom-dark-ui')
-        expect(activeThemeNames).toContain('atom-dark-syntax')
+        expect(activeThemeNames).toContain('fusion-ui')
+        expect(activeThemeNames).toContain('dark-bint-syntax')

     describe 'when the enabled UI theme is not bundled with Atom', ->
       beforeEach ->
@@ -421,12 +418,12 @@ describe "atom.themes", ->
       it 'uses the default dark UI theme', ->
         activeThemeNames = atom.themes.getActiveThemeNames()
         expect(activeThemeNames.length).toBe(2)
-        expect(activeThemeNames).toContain('atom-dark-ui')
-        expect(activeThemeNames).toContain('atom-light-syntax')
+        expect(activeThemeNames).toContain('fusion-ui')
+        expect(activeThemeNames).toContain('dark-bint-syntax')

     describe 'when the enabled syntax theme is not bundled with Atom', ->
       beforeEach ->
-        atom.config.set('core.themes', ['atom-light-ui', 'installed-dark-syntax'])
+        atom.config.set('core.themes', ['fusion-ui', 'installed-dark-syntax'])

         waitsForPromise ->
           atom.themes.activateThemes()
@@ -434,5 +431,5 @@ describe "atom.themes", ->
       it 'uses the default dark syntax theme', ->
         activeThemeNames = atom.themes.getActiveThemeNames()
         expect(activeThemeNames.length).toBe(2)
-        expect(activeThemeNames).toContain('atom-light-ui')
-        expect(activeThemeNames).toContain('atom-dark-syntax')
+        expect(activeThemeNames).toContain('fusion-ui')
+        expect(activeThemeNames).toContain('dark-bint-syntax')
diff --git a/src/theme-manager.coffee b/src/theme-manager.coffee
index 6494788..b36736c 100644
--- a/src/theme-manager.coffee
+++ b/src/theme-manager.coffee
@@ -89,23 +89,17 @@ class ThemeManager
     # available.
     if themeNames.length < 2
       builtInThemeNames = [
-        'atom-dark-syntax'
-        'atom-dark-ui'
-        'atom-light-syntax'
-        'atom-light-ui'
-        'base16-tomorrow-dark-theme'
-        'base16-tomorrow-light-theme'
-        'solarized-dark-syntax'
-        'solarized-light-syntax'
+        'fusion-ui'
+        'dark-bint-syntax'
       ]
       themeNames = _.intersection(themeNames, builtInThemeNames)
       if themeNames.length is 0
-        themeNames = ['atom-dark-syntax', 'atom-dark-ui']
+        themeNames = ['dark-bint-syntax', 'fusion-ui']
       else if themeNames.length is 1
         if _.endsWith(themeNames[0], '-ui')
-          themeNames.unshift('atom-dark-syntax')
+          themeNames.unshift('dark-bint-syntax')
         else
-          themeNames.push('atom-dark-ui')
+          themeNames.push('fusion-ui')

     # Reverse so the first (top) theme is loaded after the others. We want
     # the first/top theme to override later themes in the stack.