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On July 26, 2013, Disney XD announced that they had renewed Lab Rats for a third season. There are 23 episodes in this season. They started filming in September 2013. The first episode was released on February 17th, 2014. The premiere episode of this season was Sink or Swim. The finale episode of this season was Unauthorized Mission.
- Sink or Swim (301/302) - February 17, 2014
- The Jet-Wing (303) - February 24, 2014
- Mission: Mission Creek High (304) - March 3, 2014
- Zip It (305) - March 10, 2014
- Not So Smart Phone (306) - March 24, 2014
- Scramble the Orbs (307) - April 7, 2014
- Principal from Another Planet (316) - April 14, 2014
- Taken (308) - April 21, 2014
- Three Minus Bree (309) - June 30, 2014
- Which Father Knows Best? (310) - July 7, 2014
- Cyborg Shark Attack (313) - July 18, 2014
- You Posted What?!? (314/315) - July 28, 2014
- Armed and Dangerous (318) - September 29, 2014
- Alien Gladiators (311) - October 13, 2014
- Brother Battle (312) - October 20, 2014
- Spike Fright (319) - October 24, 2014
- Face Off (317) - November 10, 2014
- Merry Glitchmas (320) - December 1, 2014
- Rise of the Secret Soldiers (321/322) January 26, 2015
Escape To The Bionic Island is a 4 part story arc which includes the last four episodes of Season 3. This story arc introduced the Davenport Bionic Academy, and deals with the aftermath of Rise of the Secret Soldiers.
- 20. Bionic Houseparty (323) - February 2, 2015
- 21. First Day of Bionic Academy (324) - February 3, 2015
- 22. Adam Steps Up (325) - February 4, 2015
- 23. Unauthorized Mission (326) - February 5, 2015
- Billy Unger as Chase Davenport/Spike (23/23)
- Spencer Boldman as Adam Davenport (23/23)
- Kelli Berglund as Bree Davenport (23/23)
- Tyrel Jackson Williams as Leo Dooley (23/23)
- Hal Sparks as Donald Davenport (23/23)
- Angel Parker as Tasha Davenport (9/23)
- Jeremy Kent Jackson as Douglas Davenport (8/23)
- Graham Shiels as Victor Krane (3/23)
- Will Forte as Eddy/Cheddy (3/23)
- Madison Pettis as Janelle (5/23)
- Maile Flanagan as Terry Perry (13/23)
- Michaela Carrozzo as Caitlin (3/23)
- Dustin Ingram as Scott (4/23)
- Eddie Perino as Trent (2/23)
- Ashley Argota as S-1 (2/23)
- Ben Bode as Special Agent Graham (2/23)
- John Eric Bentley as Mr. President (3/23)
- Telma Hopkins as Rose Dooley (1/23)
- Cole Ewing as S-3/Sebastian (5/23)
- Max Charles as Spin (3/23)
- Brandon Salgado-Telis as Bob (3/23)
- Casey Sanders as Ship Captain
- Sandy Martin as Greta
- Marnie Crossen as Myrtle
- Margaret Easley as Regina
- Cameron Britton as Security Guard
- Karan Brar as Kal Zar
- Ashlee Füss as Sabrina
- Unknown as Flo
- Cody Griffin as Jake Chambers
- Siobhan Cook as One Of The Protesters
- Nicole Pettis as Agent Reed
- Paul Black as Bionic Bro
- Chris Grabher as Charlie
Special Guest Cast
- Andre Ethier as Himself
- This season had 3 one-hour special episodes.
- The Lab Rats bionic secret was revealed in You Posted What?!?. Leo was also given a bionic arm to replace his injured one.
- Spike returned in Spike Fright.
- Adam, Bree, and Chase got new abilities in Brother Battle.
- Hal Sparks directed the episode Brother Battle.
- This is the only season where no main cast is absent.
- This is the last season to show the new lab and the school.