Episode 1
Episode: 4x01 | Airdate: Jul 14, 2011
The Lab Rats tackle pressure and rockets, making a rocket-powered shopping trolley.
Episodes
Episode 2
Episode: 4x02 | Airdate: Jul 21, 2011
Experiments involving two plumbing plungers, opera singers and a septic tank.
Episode 3
Episode: 4x03 | Airdate: Jul 28, 2011
The Lab Rats travel back in time to Roman Britain to retrieve a formidable siege weapon.
Episode 4
Episode: 4x04 | Airdate: Aug 4, 2011
The Lab Rats attempt to build a huge tower of bubbles.
Episode 5
Episode: 4x05 | Airdate: Aug 11, 2011
The Lab Rats play a game of golf in order to test a build-up of pressure.
Episode 6
Episode: 4x06 | Airdate: Aug 18, 2011
The Lab Rats launch a combustion experiment with Ninja Nan's mobility vehicle.
Episode 7
Episode: 4x07 | Airdate: Aug 25, 2011
The Lab Rats try to devise an experiment on balance and the transfer of energy.
Episode 8
Episode: 4x08 | Airdate: Sep 1, 2011
The Lab Rats perform an experiment to discover the fastest way of sending a message.
Episode 9
Episode: 4x09 | Airdate: Sep 8, 2011
Richard and his Lab Rats devise a simple but very strange experiment to reduce friction.
Episode 10
Episode: 4x10 | Airdate: Sep 15, 2011
The Lab Rats investigate buoyancy at Richard's top secret testing facility.
Episode 11
Episode: 4x11 | Airdate: Sep 22, 2011
The Lab Rats investigate air pressure and the molecular properties of food.
Episode 12
Episode: 4x12 | Airdate: Sep 29, 2011
The Lab Rats destroy three portable toilets by igniting different fart gases.
Episode 13
Episode: 4x13 | Airdate: Oct 6, 2011
The Lab Rats need to conduct an experiment looking at the distribution of weight.