diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 8be445a0..27035c5a 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -1641,6 +1641,11 @@ getJasmineRequireObj().Env = function(j$) {
       reportSpecDone
     });
 
+    this.parallelReset = function() {
+      // TODO: ensure that autoCleanClosures was false
+      suiteBuilder.parallelReset();
+    };
+
     /**
      * Executes the specs.
      *
@@ -8365,6 +8370,7 @@ getJasmineRequireObj().Runner = function(j$) {
   class Runner {
     constructor(options) {
       this.topSuite_ = options.topSuite;
+      // TODO use names that read like getters
       this.totalSpecsDefined_ = options.totalSpecsDefined;
       this.focusedRunables_ = options.focusedRunables;
       this.runableResources_ = options.runableResources;
@@ -9623,6 +9629,10 @@ getJasmineRequireObj().Suite = function(j$) {
     this.reportedDone = false;
   };
 
+  Suite.prototype.removeChildren = function() {
+    this.children = [];
+  };
+
   Suite.prototype.addChild = function(child) {
     this.children.push(child);
   };
@@ -9838,6 +9848,12 @@ getJasmineRequireObj().SuiteBuilder = function(j$) {
       this.focusedRunables = [];
     }
 
+    parallelReset() {
+      this.topSuite.removeChildren();
+      this.totalSpecsDefined = 0;
+      this.focusedRunables = [];
+    }
+
     describe(description, definitionFn) {
       ensureIsFunction(definitionFn, 'describe');
       const suite = this.suiteFactory_(description);
@@ -10424,5 +10440,5 @@ getJasmineRequireObj().UserContext = function(j$) {
 };
 
 getJasmineRequireObj().version = function() {
-  return '4.2.0';
+  return '5.0.0-dev';
 };
diff --git a/package.json b/package.json
index fdfb6c5b..4a0653c4 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "jasmine-core",
   "license": "MIT",
-  "version": "4.2.0",
+  "version": "5.0.0-dev",
   "repository": {
     "type": "git",
     "url": "https://github.com/jasmine/jasmine.git"
diff --git a/spec/core/SuiteBuilderSpec.js b/spec/core/SuiteBuilderSpec.js
index a24fca1e..d482e81e 100644
--- a/spec/core/SuiteBuilderSpec.js
+++ b/spec/core/SuiteBuilderSpec.js
@@ -175,4 +175,69 @@ describe('SuiteBuilder', function() {
       }
     };
   }
+
+  describe('#parallelReset', function() {
+    it('removes children of the top suite', function() {
+      const env = { configuration: () => ({}) };
+      const suiteBuilder = new jasmineUnderTest.SuiteBuilder({ env });
+      suiteBuilder.describe('a suite', function() {
+        suiteBuilder.it('a nested spec');
+      });
+      suiteBuilder.it('a spec');
+
+      suiteBuilder.parallelReset();
+
+      expect(suiteBuilder.topSuite.children).toEqual([]);
+    });
+
+    it('preserves top suite befores and afters', function() {
+      const env = { configuration: () => ({}) };
+      const suiteBuilder = new jasmineUnderTest.SuiteBuilder({ env });
+
+      function beforeAll() {}
+      function beforeEach() {}
+      function afterEach() {}
+      function afterAll() {}
+
+      suiteBuilder.beforeAll(beforeAll);
+      suiteBuilder.beforeEach(beforeEach);
+      suiteBuilder.afterEach(afterEach);
+      suiteBuilder.afterAll(afterAll);
+
+      suiteBuilder.parallelReset();
+
+      expect(suiteBuilder.topSuite.beforeAllFns).toEqual([
+        jasmine.objectContaining({ fn: beforeAll })
+      ]);
+      expect(suiteBuilder.topSuite.beforeFns).toEqual([
+        jasmine.objectContaining({ fn: beforeEach })
+      ]);
+      expect(suiteBuilder.topSuite.afterFns).toEqual([
+        jasmine.objectContaining({ fn: afterEach })
+      ]);
+      expect(suiteBuilder.topSuite.afterAllFns).toEqual([
+        jasmine.objectContaining({ fn: afterAll })
+      ]);
+    });
+
+    it('resets totalSpecsDefined', function() {
+      const env = { configuration: () => ({}) };
+      const suiteBuilder = new jasmineUnderTest.SuiteBuilder({ env });
+      suiteBuilder.it('a spec');
+
+      suiteBuilder.parallelReset();
+
+      expect(suiteBuilder.totalSpecsDefined).toEqual(0);
+    });
+
+    it('resets focusedRunables', function() {
+      const env = { configuration: () => ({}) };
+      const suiteBuilder = new jasmineUnderTest.SuiteBuilder({ env });
+      suiteBuilder.fit('a spec', function() {});
+
+      suiteBuilder.parallelReset();
+
+      expect(suiteBuilder.focusedRunables).toEqual([]);
+    });
+  });
 });
diff --git a/spec/core/integration/ParallelSpec.js b/spec/core/integration/ParallelSpec.js
new file mode 100644
index 00000000..3992184b
--- /dev/null
+++ b/spec/core/integration/ParallelSpec.js
@@ -0,0 +1,104 @@
+describe('Support for parallel execution', function() {
+  let env;
+
+  beforeEach(function() {
+    env = new jasmineUnderTest.Env();
+  });
+
+  afterEach(function() {
+    env.cleanup_();
+  });
+
+  it('removes specs and suites from previous batches', async function() {
+    env.describe('a suite', function() {
+      env.it('a spec', function() {});
+    });
+    env.it('a spec', function() {});
+
+    await env.execute();
+    env.parallelReset();
+
+    env.describe('a suite in a new batch', function() {
+      env.it('a spec in a new batch', function() {});
+    });
+    const reporter = jasmine.createSpyObj('reporter', [
+      'suiteDone',
+      'specDone'
+    ]);
+    env.addReporter(reporter);
+
+    await env.execute();
+
+    expect(reporter.suiteDone).toHaveBeenCalledOnceWith(
+      jasmine.objectContaining({
+        fullName: 'a suite in a new batch'
+      })
+    );
+    expect(reporter.specDone).toHaveBeenCalledOnceWith(
+      jasmine.objectContaining({
+        fullName: 'a suite in a new batch a spec in a new batch'
+      })
+    );
+  });
+
+  it('preserves top-level before and after fns from previous batches', async function() {
+    const beforeAll = jasmine.createSpy('beforeAll');
+    const beforeEach = jasmine.createSpy('beforeEach');
+    const afterEach = jasmine.createSpy('afterEach');
+    const afterAll = jasmine.createSpy('afterAll');
+    env.beforeAll(beforeAll);
+    env.beforeEach(beforeEach);
+    env.afterEach(afterEach);
+    env.afterAll(afterAll);
+
+    env.parallelReset();
+    env.it('a spec', function() {});
+    await env.execute();
+
+    expect(beforeAll).toHaveBeenCalled();
+    expect(beforeEach).toHaveBeenCalled();
+    expect(afterEach).toHaveBeenCalled();
+    expect(afterAll).toHaveBeenCalled();
+  });
+
+  it('does not remember focused runables from previous batches', async function() {
+    env.fit('a focused spec', function() {});
+    env.parallelReset();
+    env.it('a spec', function() {});
+    const reporter = jasmine.createSpyObj('reporter', [
+      'specDone',
+      'jasmineDone'
+    ]);
+    env.addReporter(reporter);
+    await env.execute();
+
+    expect(reporter.specDone).toHaveBeenCalledOnceWith(
+      jasmine.objectContaining({
+        fullName: 'a spec',
+        status: 'passed'
+      })
+    );
+    expect(reporter.jasmineDone).toHaveBeenCalledWith(
+      jasmine.objectContaining({ overallStatus: 'passed' })
+    );
+  });
+
+  it('does not remember failures from previous batches', async function() {
+    env.it('a failing spec', function() {
+      env.expect(true).toBe(false);
+    });
+    await env.execute();
+    env.parallelReset();
+    env.it('a spec', function() {});
+    const reporter = jasmine.createSpyObj('reporter', [
+      'specDone',
+      'jasmineDone'
+    ]);
+    env.addReporter(reporter);
+    await env.execute();
+
+    expect(reporter.jasmineDone).toHaveBeenCalledWith(
+      jasmine.objectContaining({ overallStatus: 'passed' })
+    );
+  });
+});
diff --git a/src/core/Env.js b/src/core/Env.js
index b6fabb6d..ede3baa6 100644
--- a/src/core/Env.js
+++ b/src/core/Env.js
@@ -499,6 +499,11 @@ getJasmineRequireObj().Env = function(j$) {
       reportSpecDone
     });
 
+    this.parallelReset = function() {
+      // TODO: ensure that autoCleanClosures was false
+      suiteBuilder.parallelReset();
+    };
+
     /**
      * Executes the specs.
      *
diff --git a/src/core/Runner.js b/src/core/Runner.js
index c9e1c70f..7b9e0227 100644
--- a/src/core/Runner.js
+++ b/src/core/Runner.js
@@ -2,6 +2,7 @@ getJasmineRequireObj().Runner = function(j$) {
   class Runner {
     constructor(options) {
       this.topSuite_ = options.topSuite;
+      // TODO use names that read like getters
       this.totalSpecsDefined_ = options.totalSpecsDefined;
       this.focusedRunables_ = options.focusedRunables;
       this.runableResources_ = options.runableResources;
diff --git a/src/core/Suite.js b/src/core/Suite.js
index 2a0c928c..4cae0b0c 100644
--- a/src/core/Suite.js
+++ b/src/core/Suite.js
@@ -132,6 +132,10 @@ getJasmineRequireObj().Suite = function(j$) {
     this.reportedDone = false;
   };
 
+  Suite.prototype.removeChildren = function() {
+    this.children = [];
+  };
+
   Suite.prototype.addChild = function(child) {
     this.children.push(child);
   };
diff --git a/src/core/SuiteBuilder.js b/src/core/SuiteBuilder.js
index 0fe85925..1115e7a8 100644
--- a/src/core/SuiteBuilder.js
+++ b/src/core/SuiteBuilder.js
@@ -22,6 +22,12 @@ getJasmineRequireObj().SuiteBuilder = function(j$) {
       this.focusedRunables = [];
     }
 
+    parallelReset() {
+      this.topSuite.removeChildren();
+      this.totalSpecsDefined = 0;
+      this.focusedRunables = [];
+    }
+
     describe(description, definitionFn) {
       ensureIsFunction(definitionFn, 'describe');
       const suite = this.suiteFactory_(description);