Flashforward's Episode 1 is really engaging from the very beginning! This worksheet includes spotting idioms and phrases, answering questions, filling in the blanks and circling the correct word type of exercise. But you can also choose only some of the activities for lower levels (for example, activity 2 works with the past continuous.)
Students love the plot and I can assure you that they will probably download the whole season to see how it ends!!! (Or you can prepare more activities for the following episodes, upload them and share them at BusyTeacher.org!!!) I hope it will be useful for you!