...We want to take some students out to the mainland for the night.
Bree to Leo


"Left Behind" is the 3rd episode in Season 4 of Lab Rats: Bionic Island. It first aired on March 25, 2015. This is the 75th episode overall.


After sneaking a group of their bionic students off the island, Adam, Bree and Chase accidentally leave Spin and Bob behind and scramble to retrieve them before Davenport finds out.


Recurring Cast

Guest Cast

Mentioned Cast



  • In this episode, Crush, Chop, and Burn was mentioned a couple times. Like how Leo said he remembered when he took Adam, Bree, and Chase in the real world. Also when Bree wanted to take the Bionic Soldiers out of the academy, she told the others that Leo taking them to School for the first time was one of the best things that happened to them. It's shown Donald still has not gotten over the incidents that occurred in that episode.
    Wiki 09.jpg
  • This is Spin and Bob's first actual mission.
    • However, this still wasn't an assigned mission, but it was their first mission they succeed in.
  • This is the second time Hal Sparks directs an episode, the first
    Wiki 08.jpg
    being Brother Battle. This is also the first time he directs an episode in season 4.
  • A group of the Bionic Students are introduced into the real world for the first time since being released from the Triton App.
  • It's revealed Douglas isn't the only one who can disable Leo's bionics. Donald can also do so at his discretion.
  • It was revealed that the Capsules also work on normal humans.
  • Donald got stuck in Chase's Mission Suit in this episode. Leo tried to get him out. It is shown Donald got out of the suit at the end of the episode, but it got ripped/shredded up, implying that Leo used the laser cutters off-screen.
  • This is the second time Spin and Bob wanted to be "bionic heroes" and wanted to do something successful and try to impress the others. The first time was in Unauthorized Mission.
  • This is the first episode with a restaurant.


  • Chase's mission suit is torn at the end of the episode. But in the next episode, it's completely untorn.
    • Though he could have repaired it.
  • Donald mentions 3 incidents that involved each of the kids using their bionics out in the real world. However, Bree's incident technically did not involve her using her bionics.


Click here to view more images from Left Behind.
For the image gallery of Left Behind see Left Behind/Gallery.



For a full transcript of Left Behind, click here.


My favorite episode is
Left Behind!



Lab Rats Bionic Island - "Left Behind" Clip - Chase's Mission Suit


Lab Rats Bionic Island - "Left Behind" Clip - Bionic Heroes 'In Training'

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