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On July 26, 2013, Disney XD announced that they had renewed Lab Rats for a third season. There are 26 episodes in this season. They started filming in September 2013. The first episode was released on February 17, 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
- Bionic Houseparty (323) - February 2, 2015
- First Day of Bionic Academy (324) - February 3, 2015
- Adam Steps Up (325) - February 4, 2015
- 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 (11/23)
- Jeremy Kent Jackson as Douglas Davenport (10/23)
- Cole Ewing as S-3/Sebastian (5/23)
- Madison Pettis as Janelle (5/23)
- Graham Shiels as Victor Krane (4/23)
- Dustin Ingram as Scott (4/26)
- John Eric Bentley as Mr. President (4/23)
- Ben Bodé as Special Agent Graham (3/23)
- Will Forte as Eddy/Cheddy (3/23)
- Ashley Argota as Taylor (3/23)
- Max Charles as Spin (3/23)
- Brandon Salgado-Telis as Bob (3/26)
- Michaela Carrozzo as Caitlin (3/23)
- Eddie Perino as Trent (2/23)
- Telma Hopkins as Rose Dooley (1/23)
- Casey Sander as 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?!?.
- This season introduces Victor Krane and the Bionic Soldiers.
- Leo loses his arm because S-1 attempted to kill him, but was given a bionic arm to replace his injured one.
- Spike returned in the episode 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 none of the main cast is absent.
- Adam and Leo's voices are deeper this season,due to the actors,Spencer Boldman and Tyrel Jackson Williams going through deepining and puberty.
- This is the last season to show the school.
- This season ends with a cliffhanger.
- Douglas becomes good and joins the Lab Rats this season.
- This is the only season that Marcus doesn't appear in.
- This is the only season that has a finale that Douglas doesn't appear in.
- Even though it shows him doing it in the promotional art Chase never actually flies the jet-wing
- This is the last season where Leo isn't bionic.
- Starting with"You Posted What:,Leo is Bionic.
- This is the last season to feature, Janelle, Trent and Rose.
- Adam is 18, Bree is 17 and Chase and Leo are 16 this season.