I used to love this series when it first started out but since then, the quality has increasingly declined. The following is a review of the plagiarized episode from a few weeks ago; the 11th episode of the third season, titled "Here I go again".
The entire plot of the episode is a complete ripoff of Stargate SG-1 episode "Window of Opportunity", an episode in the fourth season. The episode was written by Joseph Mallozzi & Paul Mullie and originally aired on August 4th, 2000.
In "Window of Opportunity", SG-1 explores an ancient site on P4X-639 and discovers a man who sets of an Ancient device. Jack O'Neill then finds himself back at the cantina at Stargate Command, before the mission briefing. No matter what he does, he keeps reliving the same day over and over again, but he and Teal'c are the only ones who remember it. At a certain point, Daniel Jackson tells Jack that since the day just resets over and over, he could do anything without there being consequences, resulting in a hilarious montage of Jack using his time loops to get good at golf, pottery and breaking some Air Force rules. The time loops eventually stop when the man causing them is convinced by Jack to let go of the wife he lost and more on with his life.
Here we are some 18 years later and Legends of Tomorrow is looking for a cool story to do. Should they use the existing DC content? Nah.. Should they use an original story? Nah.. Let's just steal from Stargate. No one will notice. Not like they were both filmed in the same place or have the same fanbase or anything..
The episode begins with Zari screwing around with the ship, flying the AI in the process, as the rest of Legends return from a mission. Zari and Sarah have an argument and Sarah yells at Zari, telling her to go fix the ship. Zari arrives in the engine room and soon after the ship explodes, and time resets to 1 hour in the past. After a few loops, Raymond Palmer tells her that she could do anything she wanted as there are no consequences and this is immediately followed up by a montage of Zari doing different things such as "predicting" what people will say, practicing the violin and eating junk food. The loop ends when they find Gary in the garbage compactor and destroy his time-looping device thinking it is the bomb. As the actual bomb is about to go off, Zari tells the rest of the team how she feels about them in a "selfless" act and upon detonation, the simulation ends. Yes, it was all in her mind.
So, they ripped off one of the best SG-1 episodes, and certainly one of the funniest ones, to make a sub-par plagiarized jump-the-shark story that was all a dream.