"'''Left Behind'''" is the 3rd episode in [[Season 4]] of[[Lab Rats| ''Lab Rats: Bionic Island'']]. It first aired on March 25, 2015. This is the 75th episode overall.
“'''{{PAGENAME}}'''” is an unaired episode and the [[Season 4]] premiere of ''[[Lab Rats]]''. This episode is currently a speculation.
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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.
* 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|bionic soldiers]] out of the [[Davenport Bionic Academy|academy]], she told the others that Leo taking them to [[Mission Creek High School|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. [[File:Wiki 09.jpg|thumb|256x256px]]
** Other things were mentioned as well like [[Crush, Chop and Burn|Adam setting Dooey Dingo on fire]], [[Spike's Got Talent|Chase wrestling the Principal]], and [[Trent Gets Schooled|Bree having a bad picture for picture day]].
** However, this still wasn't an assigned mission, but it was their first mission they succeed in.
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* This is the second time [[Hal Sparks]] directs an episode, the first [[File:Wiki 08.jpg|thumb|252x252px]]being [[Brother Battle]]. This is also the first time he directs an episode in season 4.
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* A group of the bionic students are introduced into the real world for the first time since being released from the [[Triton App]].
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* It is revealed Douglas isn't the only one who can disable Leo's bionics. Donald can also do so at his discretion.
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* It is revealed that the [[Capsules]] also work on normal humans.
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**This is the sixth time we see a normal human inside a capsule. The first five being [[Crush, Chop, and Burn]], [[Can I Borrow the Helicopter?]], [[The Rats Strike Back]], [[You Posted What?!?]], and [[Night of the Living Virus]].
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* Donald got stuck in Chase's [[Mission Suits|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.
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* 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]].
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* This is the first episode with a restaurant.
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* Spin trapped the criminals the same way Bree trapped shipowners in [[Sink or Swim]].
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== Goofs ==
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* Donald mentions 3 incidents that involved each of the kids using their bionics out in the real world. However, Bree's incident of hair growth technically did not involve her using her bionics, but Donald may have meant that her accident wouldn't have ever happened if Adam didn't burn off her hair.
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.
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.
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.
Spin trapped the criminals the same way Bree trapped shipowners in Sink or Swim.
Goofs
Donald mentions 3 incidents that involved each of the kids using their bionics out in the real world. However, Bree's incident of hair growth technically did not involve her using her bionics, but Donald may have meant that her accident wouldn't have ever happened if Adam didn't burn off her hair.
