Leonard Snart on Street
Leonard Snart sees the black hole suck up buildings in episode 1x23 “Fast Enough”.
Barry and the team stake out of the gallery where the Turtle plans on stealing a painting in episode 2x10 “Potential Energy”.
The team watches footage of the Turtle stealing a statue in episode 2x10 “Potential Energy”.
Julian and Cisco attempt to help the amnesiac Barry testify in Heat Monger's evidentiary hearing which Cecile is prosecuting in episode 3x21 “Cause and Effect”.
Central City Jewelry
Barry tries to stop Null alone but she forces him off to save a bystander in episode 4x17 “Null and Annoyed”.
Barry, Oliver, Kara, and Clark team up to try to take down Amazo but only manage to make it more powerful when it acquires their powers in episode 5x09 “Elseworlds, Part 1”.