March 18, 2015
February 3, 2016
On May 9, 2014, Disney XD announced that they renewed Lab Rats for a fourth season. They renamed it "Lab Rats: Bionic Island". There will be 26 episodes this season. Filming started October 2014. The first episode was released on March 18, 2015. The last episode was released on February 3, 2016.
- Bionic Rebellion (403-404) - March 18, 2015
- Left Behind (401) - March 25, 2015
- Under Siege (402) - April 1, 2015
- Bionic Dog (412) - April 8, 2015
- Mission Mania (405) - April 15, 2015
- Simulation Manipulation (406) - April 22, 2015
- Forbidden Hero (408) - July 1, 2015
- Spider Island (409) - July 8, 2015
- Spike vs. Spikette (407) - July 15, 2015
- Lab Rats vs. Mighty Med: Part 1 (415) - July 22, 2015
- Space Elevator (414) - July 29, 2015
- Bionic Action Hero (410-411) - August 5, 2015
- One of Us (416) - August 12, 2015
- Bob Zombie (417) - September 30, 2015
- Human Eddy (419) - October 14, 2015
- The Curse of the Screaming Skull (420) - October 21, 2015
- Lab Rats: On the Edge (421-422) - November 11, 2015
- Uliminte Tailgate Challenge (413) - December 2, 2015
- And Then There Were Four (418) - January 13, 2016
- Space Colony (424-425) - January 20, 2016
- The Vanishing: Part 1 (423) - February 3, 2016
- The Vanishing: Part 2 (426) - February 3, 2016
- William Brent (credited as Billy Unger) as Chase Davenport/Spike (26/26)
- Spencer Boldman as Adam Davenport (26/26)
- Kelli Berglund as Bree Davenport/Spikerella (26/26)
- Tyrel Jackson Williams as Leo Dooley (26/26)
- Hal Sparks as Donald Davenport (15/26)
- Cole Ewing as Sebastian (2/26)
- Max Charles as Spin (4/26)
- Brandon Salgado-Telis as Bob (11/26)
- Jeremy Kent Jackson as Douglas Davenport (15/26)
- Maile Flanagan as Terry Perry (11/26)
- Grace Kaufman as Kerry Perry (1/26)
- Angel Parker as Tasha Davenport (5/26)
- Michaela Carrozzo as Caitlin (1/26)
- Jessalyn Wanlim as Giselle Vickers (4/26)
- Ashley Argota as Taylor (3/26)
- Mateus Ward as Marcus Davenport (2/26)
- Will Forte as Eddy/Human Eddy (1/26)
- John Eric Bentley as President Craig (2/26)
- Pearce Joza as Daniel Davenport (3/26)
- Graham Shiels as Victor Krane (2/26)
- Marissa Cuevas as Lexi (2/26)
- Jumpy the Dog as Otis (1/26)
- Unknown as Shelly (1/26)
- Unknown as Liam (1/26)
- Judith Drake as Mrs. Stern (1/26)
- Liana Ramirez as Kate/Spikette (1/26)
- Mar Mar as Reggie (1/26)
- Ryan J. Kelly as Thermo Hands (1/26)
- Damion Poitier as The Incapacitator (1/26)
- Mark Saul as Dr. Ryan (1/26)
- Leo Howard as Troy West (2/26)
- Emery Kelly as Logan (2/26)
- Ping Wu as Dr. Gao (1/26)
- PJ Brown as Officer Nichols (1/26)
Special Guest CastEdit
- Bradley Steven Perry as Kaz (1/26)
- Jake Short as Oliver (1/26)
- Jilon VanOver as Tecton (1/26)
- Jenelle McKee as Gamma Girl (1/26)
- Esteban Cueto as Grey Granite (1/26)
- Willie McGinest as Himself (1/26)
- Joel Michael Kramer as Tank (2/26)
- This season is renamed to Lab Rats: Bionic Island. It also features an updated beginning to the intro.
- This season makes Lab Rats the 2nd Disney XD series to make it to Season 4.
- Spike returned in Spike vs. Spikette, along with another student with the Commando App (Spikette) and Bree's Commando App, (Spikerella).
- Leo was given a bionic leg to replace his injured one in Space Elevator.
- There was a crossover this season with Mighty Med in Lab Rats vs. Mighty Med.
- This season features two new sets, the Mentor Quarters and the Davenport Bionic Academy.
- Hal Sparks directed the episodes Left Behind, Space Elevator, and Spider Island.
- Marcus Davenport, Taylor, and Victor Krane all return this season after the latter two were presumed deceased, while the former was brought back to life after being destroyed. Out of the three, Taylor is the only one still alive.
- There were five one-hour episodes (not including the crossover): Bionic Rebellion, Bionic Action Hero, Lab Rats: On the Edge, Space Colony, and The Vanishing. This is the most one hour episodes in a season.
- However, Like the Pair of Kings's episodes "Kings of Legend" and "The New King", The Vanishing is only aired in 2 parts.
- The season and series finale, The Vanishing, aired February 3rd, 2016.
- This is the only season...
- Donald was absent in eleven episodes. (Under Siege, Bionic Dog, Mission Mania, Forbidden Hero, Spider Island, Spike vs. Spikette, Bionic Action Hero Part 1 & 2, One of Us, Bob Zombie, The Curse of the Screaming Skull)
- Donald was absent in most of the episodes in this season.
- The Lab Rats Theme Song looks different in this season.
- All episodes in this season are aired on Wednesdays.
- The series will continue as Lab Rats: Elite Force, along with the show Mighty Med.
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